Engine Coolant Temperature
Circuit Intermittent
• Misplaced, loose or corroded terminals
• Foreign materials fouled ECTS
P0121
Throttle Position Sensor Circuit
Range/Performance Problem
• Poor connections between TPS and ECM
• Misplaced, loose or corrodes terminals
• Contaminated, deteriorated TPS
• Open or short between TPS 5V reference and ECM
• Open or short between TPS signal and ECM
• Short between TPS wires
• Faulty TPS
P0122
Throttle Position Sensor Circuit
Low Input
• Short to GND between TPS and ECM
• Open short to GND between TPS and ECM
• Short to RND between ECM and fuel tank pressure sensor
(FTPS)
• Faulty TPS or FTPS
P0123
Throttle Position Sensor Circuit
High Input
• Open or short to battery between TPS and ECM
• Open between and ECM
• Faulty TPS
P0125
Insufficient Coolant
Temperature For Closed Loop
Fuel Control
• After engine start-up, the elapsed time before feedback
operation is initiated is too long (engine coolant temperature
sensor input is insufficient for closed loop operation)
• Poor connections between ECT sensor and ECM
• Faulty ECTS
• Thermostat
P0128
Coolant thermostat stuck
• Thermostat stuck opened
P0131
HO2S Circuit Low Input (Bank
1, Sensor 1)
• Short to GND between HO2S and ECM
• Faulty front HO2S
P0132
HO2S Circuit High Input (Bank
1, Sensor 1)
• Short to battery between HO2S and ECM
• Faulty front HO2S
P0133
HO2S Circuit Slow Responsive
(Bank 1, Sensor 1)
• Front and rear HO2S connections reversed
• Faulty fuel delivery system
• Leak in intake system
• Leak in exhaust system
• Faulty MAFS ground circuit
• Faulty HO2S
If any misfire, purge solenoid valve, MAFS or HO2S heater
codes are present,do all repairs associated with those codes
before proceeding with this trouble area.
P0134
HO2S Circuit No Activity
Detected (Bank 1, Sensor 1)
• Contaminated, deteriorated or aged HO2S
• Misplaced, bent, loose or corroded connector terminals
• Faulty HO2S
If any misfire, purge solenoid valve or HO2S heater codes are
present, do all repairs associated with those codes before
proceeding this trouble area.
Page 5 of 14
24.04.2008
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