Tercel 1995-1996

1.5L L4 VIN E Std

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1.5L L4 VIN E Std

Trouble Code: P0100



Mass Airflow Sensor Circuit Malfunction

Possible Causes:



MAF sensor signal circuit is open, shorted to ground or power
 
MAF sensor ground circuit is open between sensor and ground
 
MAF sensor power circuit is open (check the power to the relay)
 
MAF sensor has failed, or the PCM has failed
 

Trouble Code: P0101



Mass Airflow Sensor Signal Range/Performance

Possible Causes:



MAF sensor signal circuit is open, shorted to ground or power
 
MAF sensor is contaminated, damaged or it has failed
 
PCM has failed
 

Trouble Code: P0110



Intake Air Temperature Sensor Circuit Malfunction

Possible Causes:



IAT sensor signal circuit is open between the sensor and PCM
 
IAT sensor signal circuit is shorted to ground or to VREF
 
IAT sensor ground circuit is open between sensor and ground
 
IAT sensor is contaminated, damaged or has failed
 
PCM has failed
 

Trouble Code: P0115



Engine Coolant Temperature Sensor Circuit Malfunction

Possible Causes:



ECT sensor signal circuit is open, shorted to ground or VREF
 
ECT sensor ground circuit is open between sensor and ground
 
ECT sensor is contaminated, damaged or has failed
 
PCM has failed
 

Trouble Code: P0116



Engine Coolant Temperature Sensor Range/Performance

Possible Causes:



Check for a low coolant level or an incorrect coolant mixture
 
ECT sensor signal circuit has high resistance
 
ECT sensor ground circuit has high resistance
 
ECT sensor is contaminated, damaged or out-of-calibration
 
PCM has failed
 

Trouble Code: P0120



TP Sensor or Switch 'A' Circuit Malfunction

Possible Causes:



TP sensor signal circuit open or shorted to ground
 
TP sensor ground circuit is open
 
TP sensor power circuit is open (check VREF circuit at PCM)
 
TP sensor is damaged or has failed
 
PCM has failed
 

Trouble Code: P0121



TP Sensor or TP Switch 'A' Signal Range/Performance

Possible Causes:



TP sensor signal circuit open or shorted to ground (intermittent)
 
TP sensor is loose at it mounting or the throttle is binding
 
TP sensor is damaged or has failed (perform a sweep test)
 
PCM has failed
 

Trouble Code: P0125



Insufficient Coolant Temperature For Closed Loop:

Possible Causes:



Check the operation of the thermostat (it may be stuck open)
 
ECT sensor signal circuit has high resistance
 
ECT sensor is out-of-calibration, skewed, or it has failed
 
Inspect for low coolant level or an incorrect coolant mixture
 

Trouble Code: P0130



HO2S-11 (Bank 1 Sensor 1) Circuit Malfunction

Possible Causes:



HO2S signal circuit is open between the sensor and the PCM
 
HO2S signal circuit is shorted to sensor or chassis ground
 
HO2S signal circuit is shorted to VREF or system power (B+)
 
HO2S is damaged, contaminated or it has failed
 

Trouble Code: P0133



HO2S-11 (Bank 1 Sensor 1) Slow Response

Possible Causes:



HO2S signal circuit is open or shorted to ground
 
HO2S element is contaminated, or HO2S heater has failed
 
Intake air leaks, exhaust manifold leaks or PCV system leaks
 
MAF sensor out of calibration (it may be dirty or contaminated)
 

Trouble Code: P0135



HO2S-11 (Bank 1 Sensor 1) Heater Circuit Malfunction

Possible Causes:



HO2S heater control circuit is open or shorted to ground
 
HO2S heater control circuit is shorted to power
 
HO2S heater power circuit is open (check power from the relay)
 
HO2S heater is damaged or has failed
 
PCM has failed
 

Trouble Code: P0136



HO2S-12 (Bank 1 Sensor 2) Circuit Malfunction

Possible Causes:



HO2S signal circuit is open or shorted to ground
 
HO2S signal circuit shorted to VREF or system power (B+)
 
HO2S is damaged, contaminated or it has failed
 
PCM has failed
 

Trouble Code: P0141



HO2S-12 (Bank 1 Sensor 2) Heater Circuit Malfunction

Possible Causes:



HO2S heater control circuit is open or shorted to ground
 
HO2S heater control circuit is shorted to power
 
HO2S heater power circuit is open (check power from the relay)
 
HO2S heater is damaged or has failed
 
PCM has failed
 

Trouble Code: P0170



Fuel System Too Rich or Too Lean (Bank 1)

Possible Causes:



Air leaks present in the exhaust manifold or exhaust pipes
 
Air being drawn in from leaks in engine gaskets or other seals
 
Base engine "mechanical" fault affecting one or more cylinders
 
Fuel control sensor is out of calibration (i.e., ECT, IAT or MAF)
 
Fuel delivery system supplying too much or too little fuel at idle or cruise (e.g., faulty fuel pump or dirty, restricted fuel filter)
 
One or more fuel injectors is dirty, leaking or stuck open/closed
 
HO2S element is contaminated, damaged or it has failed
 

Trouble Code: P0300



Multiple Cylinder Misfire Detected

Possible Causes:



Air leak in the intake manifold, or in the EGR or PCV system
 
Base engine mechanical fault that affects one or more cylinders
 
Erratic or interrupted CKP or CMP sensor signals
 
Fuel delivery component fault that affects one or more cylinders (e.g., a contaminated, dirty or sticking fuel injector)
 
Ignition system problem (coil or plug) in one or more cylinders
 

Trouble Code: P0301



Cylinder 1 Misfire Detected

Possible Causes:



Air leak in the intake manifold, or in the EGR or PCV system
 
Base engine mechanical fault that affects only one cylinder
 
Air leak in the intake manifold, or in the EGR or PCV system
 
Base engine mechanical fault that affects only one cylinder
 
Fuel component fault that affects only one cylinder (e.g., a dirty or sticking fuel injector)
 
Ignition system problem (coil or plug) that affects one cylinder
 

Trouble Code: P0302



Cylinder 2 Misfire Detected

Possible Causes:



Air leak in the intake manifold, or in the EGR or PCV system
 
Base engine mechanical fault that affects only one cylinder
 
Fuel component fault that affects only one cylinder (e.g., a dirty or sticking fuel injector)
 
Ignition system problem (coil or plug) that affects one cylinder
 

Trouble Code: P0303



Cylinder 3 Misfire Detected

Possible Causes:



Air leak in the intake manifold, or in the EGR or PCV system
 
Base engine mechanical fault that affects only one cylinder
 
Fuel component fault that affects only one cylinder (e.g., a dirty or sticking fuel injector)
 
Ignition system problem (coil or plug) that affects one cylinder
 

Trouble Code: P0304



Cylinder 4 Misfire Detected

Possible Causes:



Air leak in the intake manifold, or in the EGR or PCV system
 
Base engine mechanical fault that affects only one cylinder
 
Fuel component fault that affects only one cylinder (e.g., a dirty or sticking fuel injector)
 
Ignition system problem (coil or plug) that affects one cylinder
 

Trouble Code: P0335



Crankshaft Position Sensor 'A' Circuit Malfunction

Possible Causes:



CKP Sensor 'A' signal circuit is open or shorted to ground
 
CKP Sensor 'A' signal ground circuit is open
 
CKP Sensor 'A' signal is shorted to VREF or system power
 
CKP Sensor 'A' is damaged or has failed
 
PCM has failed
 

Trouble Code: P0340



Camshaft Position Sensor Circuit Malfunction

Possible Causes:



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

Trouble Code: P0401



EGR System Insufficient Flow Detected

Possible Causes:



EGR gas temperature sensor circuit open or shorted to VREF
 
EGR gas temperature sensor is damaged or has failed
 
EGR valve is stuck in closed position
 
EGR valve vacuum hose is disconnected or leaking
 
PCM has failed
 

Trouble Code: P0402



Excessive EGR Flow Detected

Possible Causes:



EGR gas temperature sensor circuit open or shorted to ground
 
EGR gas temperature sensor is damaged or has failed
 
EGR Vacuum Switching Valve (VSV) is damaged or has failed
 
EGR valve stuck partially or EGR valve stuck fully open
 
EGR VSV control circuit is open or shorted to system power
 
PCM has failed
 

Trouble Code: P0420



Catalyst Efficiency Below Normal (Bank 1)

Possible Causes:



Air leaks at the exhaust manifold or in the exhaust pipes
 
Catalytic converter is damaged, contaminated or has failed
 
Front HO2S or rear HO2S is contaminated with fuel or moisture
 
Front HO2S or the rear HO2S is loose in its mounting hole
 
Front HO2S is older (aged) than the rear HO2S (HO2S is lazy)
 

Trouble Code: P0441



EVAP System Incorrect Purge Flow Detected

Possible Causes:



Charcoal canister is clogged, loaded with fuel or with moisture
 
Fuel tank over-fill check valve cracked or damaged
 
Fuel tank seal leaking, fuel tank cracked or damaged/leaking
 
Fuel vapor hoses/tubes blocked or restricted, or fuel vapor control valve tube or fuel vapor vent valve assembly blocked
 
Vacuum hose or tubing cracked, damaged or disconnected
 
VSV for the canister purge solenoid is open or shorted to ground, or the purge solenoid is damaged or has failed (closed)
 
VSV for vapor pressure sensor circuit is open, shorted to ground, or sensor has failed
 
PCM has failed
 

Trouble Code: P0505



Idle Control System Malfunction

Possible Causes:



RSC or RSO control circuit is open, shorted to ground or power
 
RSO or RSO power circuit is open (test power from EFI relay)
 
IAC valve is contaminated, damaged or has failed
 

Trouble Code: P0510



Closed Throttle Position Switch Circuit Malfunction

Possible Causes:



Closed throttle position switch signal circuit is open or grounded
 
Closed throttle position switch signal circuit is shorted to power
 
Closed throttle position switch or TP sensor damaged or failed
 
PCM has failed
 

Trouble Code: P1300



Igniter Circuit Malfunction

Possible Causes:



IGT or IGF signal circuit is open or shorted to ground
 
Igniter is damaged or has failed
 
PCM has failed
 

Trouble Code: P1335



Crankshaft Position Sensor Circuit Malfunction

Possible Causes:



CKP sensor (+) circuit is open or shorted to ground
 
CKP sensor (-) circuit is open or shorted to ground
 
CKP sensor (+), (-) circuit is shorted to VREF or system power
 
CKP sensor is damaged or has failed
 
PCM has failed
 

Trouble Code: P1500



Starter Signal Circuit Malfunction

Possible Causes:



Engine starter signal circuit is open or shorted to ground
 
Engine starter signal circuit is shorted to system power (B+)
 
Starter has failed
 
PCM has failed
 

Trouble Code: P1600



PCM Battery Backup Circuit Malfunction

Possible Causes:



Battery backup circuit is open (check EFI fuse and fuse link)
 
Battery terminals are corroded or loose
 
PCM has failed
 

Trouble Code: P1605



Knock Control CPU Malfunction

Possible Causes:



Clear the codes and determine if this code resets. If the same trouble code (P1605 resets), the PCM has failed.
 
TSB TC002-03 (6/03) contains information related to this code
 

Trouble Code: P1780



Park/Neutral Position Switch Circuit Malfunction

Possible Causes:



P/N switch is shorted to ground
 
P/N switch is out-of-adjustment, damaged or has failed
 
PCM has failed
 

 
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