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Old 09-14-2005, 04:32 PM   #4
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P1132 - Lack of HO2S-11 Switch, Sensor Indicates Rich A HEGO sensor indicating rich at the end of a test is trying to correct for an over-lean condition. The test fails when the fuel control system no longer detects switching for a calibrated amount of time. See Possible Causes for DTC P1130

P1137 - Lack of HO2S-12 Switch, Sensor Indicates Lean The downstream HO2S sensors are forced rich and lean and monitored by the PCM. The test fails if the PCM does not detect the output of the HO2S in a calibrated amount of time. Pinched, shorted, and corroded wiring and pins
Crossed sensor wires
Exhaust leaks
Contaminated or damaged sensor

P1138 - Lack of HO2S-12 Switch, Sensor Indicates Rich See DTC P1137

P1150 - Lack of HO2S-21 Switch, Fuel Trim at Limit See DTC P1130

P1151 - Lack of HO2S-21 Switch, Sensor Indicates Lean A HEGO sensor indicating lean at the end of a test is trying to correct for an over-rich condition. The test fails when fuel control system no longer detects switching for a calibrated amount of time. See Possible Causes for DTC P1130

P1152 - Lack of HO2S-21 Switch, Sensor Indicates Rich A HEGO sensor indicating rich at the end of a test is trying to correct for an over-lean condition. The test fails when the fuel control system no longer detects switching for a calibrated amount of time. See Possible Causes for DTC P1130

P1157 - Lack of HO2S-22 Switch, Sensor Indicates Lean See DTC P1137

P1158 - Lack of HO2S-22 Switch, Sensor Indicates Rich See DTC P1137

P1168 - Fuel Rail Pressure Sensor in Range But Low The comprehensive component monitor (CCM) monitors the FRP pressure for acceptable fuel pressure. The test fails when the fuel pressure falls below a calibrated value. Low fuel pressure
Damaged FRP sensor
Excessive resistance in circuit
Low or no fuel
A FRP PID value below 551 kpa (80 psi) indicates a failure
Low or no fuel
A FRP PID value greater than 896 kpa (130 psi) indicates a failure

P1169 - Fuel Rail Pressure (FRP) Sensor in Range But High The comprehensive component monitor (CCM) monitors the FRP pressure for acceptable fuel pressure. The test fails when the fuel pressure falls below or exceeds a minimum/maximum calibrated value for a calibrated period of time. High fuel pressure
Low fuel pressure
Damaged FRP sensor
Excessive resistance in circuit

P1180 - Fuel Delivery System - Low The PCM receives fuel tank pressure (FTP) information from the natural gas module (NG), which uses the information to infer fuel rail pressure (FRP). The test fails when the inferred pressure is less than a minimum calibrated value. Restriction in the fuel line
Plugged fuel filter

P1181 - Fuel Delivery System - High The PCM receives fuel tank pressure (FTP) information from the natural gas module (NG), which uses the information to infer fuel rail pressure (FRP). The test fails when the inferred pressure is higher than a maximum calibrated value. Fuel pressure regulator

P1183 - Engine Oil Temperature (EOT) Sensor Circuit Malfunction Indicates EOT circuit became intermittently open or shorted while engine was running. Damaged harness
Damaged sensor
Damaged harness connector
Damaged PCM
EOT V PID reading less than 0.2 volts with key ON and engine OFF or during any engine operating mode indicates a hard fault short to ground. EOT V PID reading greater than 4.5 volts with key ON and engine OFF or during any engine operating mode indicates an open circuit hard fault.

P1184 - Engine Oil Temperature (EOT) Sensor Out of Self-Test Range Indicates EOT signal was out of Self-Test range. Correct range for KOER is 0.3-1.2 volts. Damaged harness
Damaged sensor
Damaged harness connector
Damaged PCM
Engine should be at operating temperature before running self-test.

P1229 - Supercharger Intercooler Pump (ICP) Pump Not Operating The ICP DTC will be set when the PCM is calling for the pump to be operating but no current is being detected. Pump motor open circuited
Pump relay coil open
Open circuit between relay and pump
Damaged PCM
Pump motor shorted
Open circuit between PCM and relay
Poor pump ground connection
Check for voltage at relay, check fuse in power feed, check ground connection of pump motor, PID reading is on/off.

P1232 - Low Speed Fuel Pump Primary Circuit Malfunction The PCM monitors the low speed fuel pump (LFP) primary circuit output from the PCM. The test fails if: When the LFP circuit is commanded on (grounded), excessive current draw is detected on the LFP circuit; or when the LFP circuit is commanded off, voltage is not detected on the LFP circuit (the PCM expects to detect VPWR voltage coming through the low speed fuel pump relay coil to the LFP circuit). Open or shorted low fuel pump (LFP) circuit
Open VPWR to low speed fuel pump relay
Damaged low speed fuel pump relay
Damaged PCM
An open circuit or short to ground can only be detected with the low speed fuel pump.
A short to power can only be detected with the low speed fuel pump commanded on.
During KOEO and KOER Self-Test, the low speed fuel pump output command will be cycled on and off.

P1233 - Fuel System Disabled or Offline LS6/LS8:
For LS6/LS8, P1233 indicates the PCM is not receiving the fuel level information on SCP from the rear electronics module (REM). Refer to the Workshop Manual Section 413-01 for diagnostics.
All Others:
The PCM monitors the fuel pump monitor (FPM) circuit from the fuel pump driver module (FPDM). With the key on, the FPDM continuously sends a duty cycle signal to the PCM through the FPM circuit. The test fails if the PCM stops receiving the duty cycle signal. Inertia fuel shutoff (IFS) switch needs to be reset
Open FPDM ground circuit
Open or shorted FPM circuit
Damaged IFS switch
Damaged FPDM
Damaged PCM
Also for Escort/Tracer and Mustang:
Open FPDM PWR circuit
Open B+ circuit to constant control relay module (CCRM) pin 11
Open ground to CCRM pin 18 (Mustang)
Damaged CCRM
Also for Continental:
Open VPWR circuit to FPDM
The PCM expects to see one of the following duty cycle signals from the FPDM on the FPM circuit: 1) 50% (500 msec on, 500 msec off), all OK. 2) 25% (250 msec on, 750 msec off), FPDM did not receive a fuel pump (FP) duty cycle command from the PCM, or the duty cycle that was received was invalid. 3) 75% (750 msec ON, 250 OFF), the FPDM has detected a fault in the circuits between the FPDM and the fuel pump.

P1234 - Fuel System Disabled or Offline See DTC P1233. P1234 is identical to P1233 except P1234 will not illuminate the MIL.

P1235 - Fuel Pump Control Out Of Range Note: For LS6/LS8, the FPDM functions are incorporated in the Rear Electronics Module (REM). Also, the REM does not use a FPM circuit. Diagnostic information will be sent through SCP.
Indicates that the FPDM has detected an invalid or missing FP circuit signal from the PCM. The FPDM will send a message to the PCM through the FPM circuit, indicating that this failure has been detected. The PCM will set the DTC when the message is received. FP circuit open or shorted
Damaged FPDM.
Damaged PCM
The FPDM sends a 25% duty cycle (250 msec ON, 750 msec OFF) through the FPM circuit to the PCM while the fault is being detected by the FPDM. If the fault is no longer detected, the PDM will return to sending an "all OK" (50% duty cycle) message to the PCM. The PCM will keep P1235 stored in Continuous Memory.

P1236 - Fuel Pump Control Out Of Range See DTC P1235. P1236 is identical to P1235 except P1236 will not illuminate the MIL.

P1237 - Fuel Pump Secondary Circuit Malfunction Note: For LS6/LS8, the FPDM functions are incorporated in the rear electronics module (REM). Also, the REM does not use a FPM circuit. Diagnostic information will be set through SCP.
Indicates that the FPDM has detected a fuel pump secondary circuit fault. The FPDM will send a message to the PCM through the FPM circuit, indicating that this failure has been detected. The PCM will set the DTC when the message is received. Open or shorted FP PWR circuit
Open FP RTN circuit to FPDM
Open or shorted circuit in the fuel pump
Locked fuel pump rotor
Damaged FPDM
For LS6/LS8, circuits associated with the Fuel Pump relay
The FPDM sends a 75% duty cycle (750 msec ON, 250 msec OFF) through the FPM circuit to the PCM while the fault is being detected by the FPDM. If the fault is no longer detected, the PCM will return to sending an "all OK" (50% duty cycle) message to the PCM. The PCM will keep P1237 stored in Continuous Memory.
The FPDM controls pump speed by supplying a "variable" ground on the RTN circuit.

P1238 - Fuel Pump Secondary Circuit Malfunction See DTC P1237. P1238 is identical to P1237 except P1238 will not illuminate the MIL.
P1244 - Generator Load Input Low The PCM monitors the GLI circuit, and will set the DTC when the input is below calibrated limit for a calibrated amount of time. GLI circuit open or short
Damaged voltage regulator/generator
Damaged PCM
Verify operation of charging system.

P1245 - Generator Load Input High The PCM monitors the GLI circuit, and will set the DTC when the input is above a calibrated limit for a calibrated amount of time. GLI circuit open or short
Damaged voltage regulator/generator
Damaged PCM
Verify operation of charging system.

P1246 - Generator Load Input (2.0L Cougar) The PCM monitors the GLI circuit, and will set the DTC when the input is not within a calibrated limit for a calibrated amount of time. GLI circuit concern.
Damaged voltage regulator/generator
Damaged PCM.
Verify operation of charging system.
Verify battery is at proper charge.

P1246 - Generator Load Input Failed (All Others) The PCM monitors generator load from the generator/regulator in the form of frequency. The frequency range is determined by the temperature of the voltage regulator where 97% represents full load, below 6% means no load. Generator circuit short to GND
Generator circuit short to PWR
Generator circuit open
Generator drive mechanism
Damaged generator/regulator assembly
Damaged PCM
Verify battery voltage is 14.5V.
Verify generator/regulator has the correct part number.

P1260 - Theft Detected - Vehicle Immobilized Indicates that the passive anti-theft system (PATS) has determined a theft condition existed and the engine is disabled. This DTC is a good indicator to check the PATS for DTCs. Previous theft condition
Anti-Theft System failure
Theft indicator flashing rapidly or on solid when ignition switch is in the ON position. Check anti-theft system for DTCs. Typical vehicle symptoms are: Start/Stall or Crank/No Start. NOTE: No crank symptom only on vehicles equipped with PATS starter disable feature.

P1270 - Engine RPM/Vehicle Speed Limiter Indicates the vehicle has been operated in a manner which caused the engine or vehicle to exceed a calibration limit. The engine rpm and vehicle speed are continuously monitored by the PCM. The DTC is set when the rpm or speed fall out of calibrated range. For additional information on the engine rpm/vehicle speed limiter, refer to Section 1, Electronic Engine Control (EC) System , Powertrain Control Software. Wheel slippage (water, ice, mud and snow)
Excessive engine rpm in Neutral
Vehicle drive at a high rate of speed
The DTC indicates the vehicle has been operated in a manner which caused the engine or vehicle speed to exceed a calibrated limit.

P1285 - Cylinder Head Over Temperature Sensed Indicates an engine overheat condition was sensed by the cylinder head temperature sensor. Low engine coolant level
Base engine concerns
Engine cooling system concerns
CHT sensor concern
On some applications when this fault occurs the Engine Temperature warning indicator will illuminate and/or force the temperature gauge to full H (Hot) zone by grounding the engine temperature warning circuit.

P1288 - Cylinder Head Temperature (CHT) Sensor Circuit Out of Self-Test Range Indicates the CHT sensor is out of Self-Test range. Engine not at operating temperature. Cold engine
Engine overheating
Damaged harness connector
Damaged PCM
Low engine coolant level
Damaged CHT sensor
Bring engine to operating temperature. If cold, re-run self-test. If engine over-heats check cooling system.

P1289 - Cylinder Head Temperature (CHT) Sensor Circuit High Input (PCM STRATEGIES UP TO AND INCLUDING 1998) Indicates a CHT sensor circuit malfunction (shorted). Grounded circuit in CHT harness
Damaged CHT sensor
Improper harness connection
Damaged PCM
CHT V PID reading less than 0.2 volts with key ON and engine OFF or during any engine operating mode indicates a hard fault. Note: DTC P0117 may also be reported when this DTC is set, either of these DTC's will activate the MIL light.

P1289 - Cylinder Head Temperature (CHT) Sensor Circuit High Input (PCM STRATEGIES 1999 AND BEYOND) Indicates a CHT sensor circuit malfunction (open). Open circuit in CHT harness
Damaged CHT sensor
Improper harness connection
Damaged PCM
CHT V PID reading greater than 4.6 volts with key ON and engine OFF or during any engine operating mode indicates a hard fault. Note: DTC P0118 may also be reported when this DTC is set, either of these DTC's will activate the MIL light.

P1290 - Cylinder Head Temperature (CHT) Sensor Circuit Low Input (PCM STRATEGIES UP TO AND INCLUDING 1998) Indicates a CHT sensor circuit malfunction (open). Open circuit in CHT harness
Damaged CHT sensor
Improper harness connection
Damaged PCM
CHT V PID reading greater than 4.6 volts with key ON and engine OFF or during any engine operating mode indicates a hard fault. Note: DTC P0118 may also be reported when this DTC is set, either of these DTC's will activate the MIL light.

P1290 - Cylinder Head Temperature (CHT) Sensor Circuit Low Input (PCM STRATEGIES 1999 AND BEYOND) Indicates a CHT sensor circuit malfunction (shorted). Grounded circuit in CHT harness
Damaged CHT sensor
Improper harness connection
Damaged PCM
CHT V PID reading greater than 4.6 volts with key ON and engine OFF or during any engine operating mode indicates a hard fault. Note: DTC P0118 may also be reported when this DTC is set, either of these DTC's will activate the MIL light.

P1299 - Cylinder Head Over Temperature Protection Active Indicates an engine overheat condition was detected by the cylinder head temperature (CHT) sensor. An FMEM Strategy called Fail-safe Cooling was activated to cool the engine. Engine cooling system concerns
Low engine coolant level
Base engine concerns
Refer to Section 1, Powertrain Control Software , for more information on Fail-safe Cooling Strategy and cylinder head temperature sensor.

P1309 - Misfire Monitor Disabled When the misfire monitor is disabled, usually due to the input signal generated by the camshaft position (CMP) sensor, by sensing the passage of teeth from the CMP wheel. Camshaft position sensor
Powertrain control module
ECT, MAF, and CKP sensors
Verify the CMP is installed correctly and not out of synchronization.

P1380 - Variable Cam Timing Solenoid A Circuit Malfunction The comprehensive component monitor(CCM) monitors the VCT circuit to the PCM for high and low voltage. If during testing voltage was to fall below a calibrated limit a calibrated amount of time the test will fail. Open or short VCT circuit
Open VPWR circuit
Damaged PCM
Open or short VCT solenoid valve
DTC P1380 is a VCT circuit check. Testing should include wires, solenoid coil and PCM.

P1381 - Variable Cam Timing Over-advanced (Bank 1) The comprehensive component monitor (CCM) monitors the VCT position for an over-advanced camshaft timing. The test fails when the camshaft timing exceeds a maximum calibrated value or remains in an advanced position. Cam timing improperly set
No oil flow to the VCT piston chamber
Low oil pressure
VCT solenoid valve stuck closed
Camshaft advance mechanism binding (VCT unit)
P1381 DTC is a check of the VCT unit. Testing should not include electrical checks. Diagnostics and repair for the VCT unit are located in the Workshop Manual.

P1383 - Variable Cam Timing Over-retarded (Bank 1) The comprehensive component monitor (CCM) monitors the VCT position for over-retarded camshaft timing. The test fails when the camshaft timing exceeds a maximum calibrated value or remains in an retarded position. Cam timing improperly set
Continuous oil flow to the VCT piston chamber
VCT solenoid valve stuck open
Camshaft advance mechanism binding (VCT unit)
DTC P1383 is a check of the VCT unit. Testing should not include electrical checks. Engine will idle rough, hard starting and may stall. Diagnostics and repair for the VCT unit are located in the Workshop Manual.
P1400 - DPF EGR Sensor Circuit Low Voltage Detected The EGR monitor checks the DPF EGR sensor signal to the PCM for low voltage. The test fails when the average voltage to the PCM drops to a voltage less than the minimum calibrated value. DPFEGR circuit short to GND
Damaged DPF EGR sensor
VREF short to GND
Damaged PCM
A DPF EGR PID reading less than 0.2 volt with the key ON and engine OFF or running, indicates a hard fault.

P1401 - DPF EGR Sensor Circuit High Voltage Detected The EGR monitor checks the DPF EGR sensor signal to the PCM for high voltage. The test fails when the average voltage to the PCM goes to a voltage greater than the maximum calibrated value. DPF EGR circuit open
VREF short to PWR
Damaged DPF EGR sensor
DPFEGR circuit short to PWR
SIG RTN circuit open
Damaged PCM
A DPF EGR PID reading greater than 4.5 volts with the key ON and engine OFF or running, indicates a hard fault.

P1405 - DPF EGR Sensor Upstream Hose Off or Plugged While driving, the EGR monitor commands the EGR valve closed and checks the differential pressure across the EGR orifice. The test fails when the signal from the DPF EGR sensor indicates EGR flow is in the negative direction. Upstream hose is disconnected
Upstream hose is plugged (ice)
Plugged or damaged EGR tube
Look for signs of water or icing in hose
Verify hose connection and routing (no excessive dips)
Verify DPF EGR sensor proper mounting and function (view DPF EGR PID while applying and releasing vacuum directly to sensor with a hand pump)

P1406 - DPF EGR Sensor Downstream Hose Off or Plugged While driving, the EGR monitor commands the EGR valve closed and checks the differential pressure across the EGR orifice. The test fails when the signal from the DPF EGR sensor continues to indicate EGR flow even after the EGR valve is commanded closed. Downstream hose is disconnected
Downstream hose is plugged (ice)
Plugged or damaged EGR tube
Look for signs of water or icing in hose
Verify connection and routing (no excessive dips)
Verify DPF EGR sensor proper mounting and function (view DPFEGR PID while applying and releasing vacuum directly to sensor with a hand pump)

P1408 - EGR Flow Out of Self-Test Range (Non MIL) This test is performed during the KOER on demand self-test only. The EGR system is commanded ON at a fixed engine speed. The test fails and the DTC is output when the measured EGR flow falls above or below the required calibration . For vacuum activated systems see Possible Causes for DTC P0401.For electric motor system see Possible Causes DTC P0400. For Electric EGR, use the output state control function of the scan tool and monitor the MAP PID (MAP) and the EEGR PID (EGRMDSD) while commanding the EEGR on. If EGR is introduced into the engine at idle, the rpm will drop or stall out. For vacuum systems see Diagnostic Aids for P0401.
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