626 1999-2001

2.5L V6 VIN - Auto 4

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Trouble Code: P1112



Intake Air Temperature Sensor Signal Circuit Malfunction

Possible Causes:



IAT sensor signal circuit is open (intermittent fault)
 
IAT sensor signal circuit is shorted to ground (intermittent fault)
 
IAT sensor ground circuit is open (intermittent fault)
 
IAT sensor is damaged or has failed
 
PCM has failed
 

Trouble Code: P1116



Engine Coolant Temperature Sensor Circuit Malfunction (Self-Test)

Possible Causes:



ECT sensor signal circuit open or shorted to ground
 
ECT sensor signal shorted to VREF or system power
 
ECT sensor
 

Trouble Code: P1117



Engine Coolant Temperature Sensor Circuit Malfunction

Possible Causes:



ECT sensor signal is open (fault may be intermittent)
 
ECT sensor signal shorted to ground (fault may be intermittent)
 
ECT sensor signal shorted to VREF (fault may be intermittent)
 
ECT sensor ground circuit is open (fault may be intermittent)
 
ECT sensor is damaged or has failed
 
PCM has failed
 

Trouble Code: P1120



TP Sensor Signal Out of Range Low

Possible Causes:



TP sensor contacts are loose, broken or damaged
 
TP sensor pins are loose in the connector
 
TP sensor signal circuit shorted to ground (an intermittent fault)
 
TP sensor is damaged or has failed
 
PCM has failed
 

Trouble Code: P1121



Throttle Position Signal Not Consistent With MAF Signal

Possible Causes:



MAF sensor is damaged or has failed
 
TP sensor is damaged or has failed
 
Air leaks between the MAF sensor and the throttle body
 
PCM has failed
 

Trouble Code: P1124



Throttle Position Sensor Signal Out Of Range (Self-Test)

Possible Causes:



Throttle linkage is bent or binding
 
TP sensor is not seated properly
 
Throttle plate below closed throttle position, or throttle plate screw misadjusted
 
TP sensor is damaged
 
PCM has failed
 

Trouble Code: P1125



Throttle Position Sensor Signal Circuit Malfunction

Possible Causes:



TP sensor wiring harness is open (an intermittent fault)
 
TP sensor connector or pins are open (an intermittent fault)
 
TP sensor signal circuit is open (an intermittent fault)
 
TP sensor signal circuit is grounded (an intermittent fault)
 

Trouble Code: P1127



HO2S-12 Heater Not Enabled (Self-Test)

Possible Causes:



Engine not operated long enough prior to beginning the KOER Self-Test
 
Exhaust system temperature is too cold to run the test
 

Trouble Code: P1130



HO2S-11 Fuel Control Limit Reached

Possible Causes:



HO2S is damaged or has failed
 
HO2S circuits wet or oily, corroded, or poor terminal contact
 
HO2S signal circuit open, shorted to ground, short to power
 
Low fuel pressure or vehicle driven until it was out of fuel
 
Fuel pressure regulator leaking, or fuel injectors leaking
 
EVAP vapor recovery system has failed
 
Air leaks located after the MAF sensor
 
Exhaust leaks before or near the front HO2S
 
EGR valve stuck, EGR diaphragm leaking, or gasket leaking
 
Oil dipstick not seated or engine oil level too high (overfilled)
 

Trouble Code: P1131



HO2S-11 (Bank 1 Sensor 1) Indicates A/F Ratio Too Lean

Possible Causes:



Air leaks located after the MAF sensor
 
Base Engine: Check for vacuum leaks with a Smoke Tester
 
Intake air system is leaking, obstructed and damaged
 
Low fuel pressure or vehicle driven until it was out of fuel
 
PCV system has air leaks at the valve or related hoses
 

Trouble Code: P1132



HO2S-11 (Bank 1 Sensor 1) Indicates A/F Ratio Too Rich

Possible Causes:



Check air cleaner element, air cleaner housing for blockage
 
Fuel pressure regulator is leaking, or fuel pressure is too high
 
Fuel injectors leaking or contaminated (they may be sticking)
 
EVAP vapor recovery system has failed (canister full of fuel)
 

Trouble Code: P1137



HO2S-12 Lack of Switching, Indicates Lean (Self-Test)

Possible Causes:



Air leaks located after the MAF sensor
 
Base Engine: Check for vacuum leaks with a Smoke Tester
 
HO2S wiring may be crossed at the connector
 
Check intake air system for leaks, obstructions and damage
 
EGR system malfunction (the EGR valve may be stuck open)
 
PCV system has air leaks at the valve or related hoses
 
Fuel pressure is too low (fuel filter is dirty, or weak fuel pump)
 
Vehicle driven until it was out of fuel
 

Trouble Code: P1138



HO2S-12 Lack of Switching, Indicates Rich (Self-Test)

Possible Causes:



Check air cleaner element, air cleaner housing for blockage
 
Fuel pressure regulator is leaking, or fuel pressure is too high
 
HO2S wiring may be crossed at the connector
 
Fuel injectors leaking or contaminated (they may be sticking)
 
EVAP vapor recovery system has failed (canister full of fuel)
 

Trouble Code: P1143



HO2S-22 Input Indicates A/F Ratio Too Lean (Self-Test)

Possible Causes:



Air leaks located after the MAF sensor
 
Base Engine: Check for vacuum leaks with a Smoke Tester
 
HO2S wiring may be crossed at the connector
 
Check intake air system for leaks, obstructions and damage
 
PCV system has air leaks at the valve or related hoses
 
Fuel pressure is too low (fuel filter is dirty, or weak fuel pump)
 
Vehicle driven until it was out of fuel
 

Trouble Code: P1144



HO2S-22 (Bank 2 Sensor 2) Indicates A/F Ratio Too Rich (Self-Test)

Possible Causes:



Check air cleaner element, air cleaner housing for blockage
 
HO2S wiring may be crossed at the connector
 
Fuel pressure regulator is leaking, or fuel pressure is too high
 
Fuel injectors leaking or contaminated (they may be sticking)
 
EVAP vapor recovery system has failed (canister full of fuel)
 

Trouble Code: P1150



HO2S-21 (Bank 2 Sensor 1) Fuel Control Limit Reached

Possible Causes:



HO2S is damaged or has failed
 
HO2S circuits wet or oily, corroded, or poor terminal contact
 
HO2S signal circuit open, shorted to ground, short to power
 
Low fuel pressure or vehicle driven until it was out of fuel
 
Excessive fuel pressure, leaking or contaminated fuel injectors
 
Leaking fuel pressure regulator
 
EVAP vapor recovery system has failed
 
Air leaks located after the MAF sensor
 
Exhaust leaks before or near the front HO2S
 
EGR valve stuck, EGR diaphragm leaking, or gasket leaking
 
Oil dipstick not seated or engine oil level too high (overfilled)
 

Trouble Code: P1151



HO2S-21 (Bank 1 Sensor 1) Indicates A/F Ratio Too Lean

Possible Causes:



Air leaks located after the MAF sensor
 
Base Engine: Check for vacuum leaks with a Smoke Tester
 
Intake air system is leaking, obstructed and damaged
 
Low fuel pressure or vehicle driven until it was out of fuel
 
PCV system has air leaks at the valve or related hoses
 

Trouble Code: P1152



HO2S-21 (Bank 2 Sensor 1) Indicates A/F Ratio Too Rich

Possible Causes:



Check air cleaner element, air cleaner housing for blockage
 
Fuel pressure regulator is leaking, or fuel pressure is too high
 
Fuel injectors leaking or contaminated (they may be sticking)
 
EVAP vapor recovery system has failed (canister full of fuel)
 

Trouble Code: P1157



HO2S-22 Lack of Switching, Indicates Lean (Self-Test)

Possible Causes:



An air leak that is located after the MAF sensor
 
Base Engine: Check for vacuum leaks with a Smoke Tester
 
HO2S wiring may be crossed at the connector
 
Check intake air system for leaks, obstructions and damage
 
EGR system malfunction (the EGR valve may be stuck open)
 
PCV system has air leaks at the valve or related hoses
 
Fuel pressure is too low (fuel filter is dirty, or weak fuel pump)
 
Vehicle driven until it was out of fuel
 

Trouble Code: P1158



HO2S-22 Lack of Switching, Indicates Rich (Self-Test)

Possible Causes:



Check air cleaner element, air cleaner housing for blockage
 
Fuel pressure regulator is leaking, or fuel pressure is too high
 
HO2S wiring may be crossed at the connector
 
Fuel injectors leaking or contaminated (they may be sticking)
 
EVAP vapor recovery system has failed (canister full of fuel)
 

Trouble Code: P1250



Pressure Regulator Control Solenoid Circuit Malfunction (Self-Test)

Possible Causes:



PRC control solenoid circuit is open or shorted to ground
 
Fuel pump relay power circuit is open
 
PCM has failed
 

Trouble Code: P1345



Camshaft Position (SGC) Sensor Circuit Malfunction

Possible Causes:



CMP sensor signal circuit is open or shorted to ground
 
CMP sensor signal circuit is shorted to VREF or system power
 
CMP sensor power circuit open between sensor and main relay
 
CMP sensor is damaged or has failed
 
PCM has failed
 

Trouble Code: P1409



EGR Vacuum Regulator Solenoid Circuit Malfunction

Possible Causes:



EGR VR solenoid control circuit is open
 
EGR VR solenoid control circuit is shorted to ground
 
EGR VR solenoid control circuit is shorted to system power
 
EGR VR solenoid is damaged or has failed
 
PCM has failed
 

Trouble Code: P1410



EGR Boost Sensor Solenoid Valve Stuck

Possible Causes:



Air leaks located after the MAF sensor assembly
 
EGR/BARO sensor is damaged or has failed
 
EGRC solenoid valve is damaged or has failed
 
EGR sensor vacuum hose to EGR Boost solenoid is loose
 
EGR sensor vacuum hose to the intake manifold is loose
 
EGRC or EGR/BARO sensor harness/connector damaged
 
PCM has failed
 

Trouble Code: P1450



EVAP Control System Excessive Vacuum Detected

Possible Causes:



Air filter element is extremely dirty or clogged
 
Canister drain cut valve (CDCV) is damaged or has failed
 
Charcoal canister is full of fuel or moisture, or is damaged
 
EVAP system drain passage is clogged
 
Fuel tank pressure sensor is damaged or out-of-calibration
 
Purge solenoid valve is damaged or has failed
 

Trouble Code: P1450



Evaporative Emission Control System Malfunction (Excessive Vacuum)

Possible Causes:



-Canister drain cut valve malfunction
 
-Air filter clogged
 
-Charcoal canister malfunction
 
-Evaporative drain passage clogged
 
-Fuel tank pressure sensor malfunction
 
-Purge solenoid valve malfunction
 

Trouble Code: P1451



Canister Drain Vent Solenoid Circuit Malfunction

Possible Causes:



CDCV solenoid control circuit is open or shorted to ground
 
CDCV solenoid control circuit is shorted to system power (B+)
 
CDCV solenoid is damaged or has failed
 
PCM has failed
 

Trouble Code: P1460



Wide Open Throttle A/C Cut-Off Relay Circuit Malfunction

Possible Causes:



A/C relay is damaged or has failed
 
A/C relay power circuit is open between relay and ENGINE fuse
 
A/C relay control circuit is open between the relay and the PCM
 
A/C relay control circuit is shorted to ground
 
A/C relay control circuit is shorted to system power (B+)
 
PCM has failed
 

Trouble Code: P1464



A/C Control Signal Circuit Malfunction (Self-Test)

Possible Causes:



A/C relay is damaged or has failed
 
A/C relay power circuit is open between relay and ENGINE fuse
 
A/C relay control circuit is open between the relay and the PCM
 
A/C relay control circuit is shorted to ground
 
A/C relay control circuit is shorted to system power (B+)
 
PCM has failed
 

Trouble Code: P1474



Fan Control Relay Control Circuit Malfunction

Possible Causes:



Cooling fan relay control circuit is open or shorted to ground
 
Cooling fan relay control circuit is shorted to system power (B+)
 
Cooling fan relay power circuit is open or shorted to ground
 
Cooling fan relay is damaged or has failed
 
PCM has failed
 

Trouble Code: P1479



Condenser Fan Relay Control Circuit Malfunction

Possible Causes:



Condenser fan relay control circuit is open or shorted to ground
 
Condenser fan relay control circuit is shorted to system power
 
Condenser fan relay power circuit is open or shorted to ground
 
Condenser fan relay is damaged or has failed
 
PCM has failed
 

Trouble Code: P1487



EGR Boost Sensor Solenoid Circuit Malfunction

Possible Causes:



EGR boost sensor solenoid circuit is open or shorted to ground
 
EGR boost sensor solenoid power circuit is open
 
EGR boost sensor solenoid is damaged or has failed
 
PCM has failed
 

Trouble Code: P1501



Vehicle Speed Sensor Circuit Malfunction (Self-Test)

Possible Causes:



Charging system problem (check alternator for AC leakage)
 
Ignition system component has failed (i.e., check for signs of primary or secondary voltage leaking from the coil, coil wire, spark plug wires or boots, or the spark plug insulators
 
PCM has failed
 

Trouble Code: P1504



Idle Air Control Solenoid Circuit Malfunction

Possible Causes:



IAC solenoid control circuit is open or shorted to ground
 
IAC solenoid power circuit is open between the valve and PCM
 
IAC solenoid is damaged or has failed
 
PCM has failed
 

Trouble Code: P1504



Idle Air Control Solenoid Circuit Malfunction

Possible Causes:



IAC solenoid No. 1 or No. 2 control circuit is open
 
IAC solenoid No. 1 or No. 2 control circuit is shorted to ground
 
IAC solenoid is damaged or has failed (an intermittent fault)
 
PCM has failed
 

Trouble Code: P1506



Idle Air Control System RPM Higher Than Expected

Possible Causes:



EGR valve is stuck open or leaking, or the gasket is leaking
 
EVAP purge valve is leaking or stuck in open position
 
IAC solenoid control circuit is shorted to ground (intermittent)
 
IAC valve is stuck open (it may be dirty or have failed)
 
PCV valve is leaking, or a leak in the intake manifold exists
 
PCM has failed
 

Trouble Code: P1507



Idle Air Control System RPM Lower Than Expected

Possible Causes:



Air filter element is severely restricted, or air inlet is plugged
 
Base engine problems: cylinder compression or valve timing
 
IAC valve is stuck in one position (it may be dirty or has failed)
 
IAC solenoid or valve is damaged or has failed
 
Throttle body is dirty, damaged or contaminated
 
PCM has failed
 

Trouble Code: P1507



Idle Air Control System RPM Lower Than Expected

Possible Causes:



EGR valve is stuck open or leaking, or the gasket is leaking
 
EVAP purge valve is leaking or stuck in open position
 
IAC solenoid control circuit is shorted to ground (intermittent)
 
IAC valve is stuck open (it may be dirty or have failed)
 
PCV valve is leaking, or a leak in the intake manifold exists
 
PCM has failed
 

Trouble Code: P1512



Variable Timing Control System Malfunction

Possible Causes:



VTCS actuator control circuit is shorted to ground
 
VTCS shutter valve actuator is stuck closed
 
VTCS vacuum hose is loose or disconnected
 
VTCS valve is damaged or has failed
 
PCM has failed
 

Trouble Code: P1569



Variable Timing Control System Circuit Low Input

Possible Causes:



VTCS control circuit is shorted to ground
 
VTCS solenoid valve is damaged or has failed
 
PCM is damaged
 

 
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