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POSSIBLE CAUSES ECM GROUND CIRCUIT(S) OPEN FUSED B+ CIRCUIT OPEN FUSED IGNITION SWITCH OUTPUT CIRCUIT OPEN DIAGNOSTIC PROCEDURE NOTE: Refer to VERIFICATION TESTS for appropriate verification test procedures. Turn the ignition off. Disconnect the ECM harness connectors. Using a 12-volt test light connected to 12-volts, check each of the ECM ground circuits in ECM harness…

POSSIBLE CAUSES MIS-WIRED APPS VOLTAGE NOT CHANGING DURING SWEEP THROTTLE PEDAL NOT MOVING FREELY APPS DIAGNOSTIC PROCEDURE NOTE: Refer to VERIFICATION TESTS for appropriate verification test procedures. Turn the ignition off. Remove the APPS cover. Inspect both APPS connector and ECM for proper wiring. Are both connectors wired correctly? Yes –> Go To 2 No…

Symptom: P0487 AIR FLOW CONTROL VALVE SHORT TO GROUND When Monitored: With the ignition on and the ECM EGR Air Flow Control Valve command off. Set Condition: The ECM does not detect voltage on the EGR Air Flow Control Valve Control circuit. POSSIBLE CAUSES INTERMITTENT CONDITION ECM/PCM RELAY OUTPUT CIRCUIT OPEN EGR AIR FLOW CONTROL…

The rear oxygen sensor on your 2001 Nissan Frontier monitors Catalytic Converter efficiency. So the problem could actually be the CAT or the rear oxygen sensor. Prior to replacing the Cat the rear sensor needs to be inspected.

Trouble codes P0431 and P0421 on your Mitsubishi indicate a problem with the Catalytic Converter (in the worst case) and simply several cold starts (in the best case). Basically this means that the oxygen sensor downstream of the catalytic converter detected that the CAT is not working as efficiently as it should be. Most likely…

Trouble OBD II code P0449 refers your Chevy Silverado’s evaporative emission control system vent valve or solenoid circuit. Trouble code P0449 can be caused by something as simple as a loose gas cap. We’d recommend filling a full tank of fuel and insuring your gas cap is screwed on tight. If in fact the problem…

Both the oil burning and the defective camshaft position sensor would have hurt the CAT. A defective camshaft position sensor can cause problems ranging from no spark combustion conditions including excessively long cranking time when starting cold, rough running, poor idle, stumbling or hesitation, mileage drop and stalling upon acceleration. However before replacing the catalytic…

Trouble Code P0420 indicates a problem with your Nissan Maxima’s three-way catalytic converter or not as efficiently as the ECU is expecting. The problem can be due to the CAT not functioning properly or a defect with the rear oxygen sensor which is used to report the condition of the exhaust exiting the CAT. If…

J Gate – incorrect setting Selector cable adjustment / installationincorrect Range sensor incorrect installation /adjustment D – 4 Switch to TCM circuit: short circuit, open circuit, high resistance J-Gate ground circuit:open circuit, high resistance TCM Ground circuit: open circuit, high resistance

TCM Power supply circuit: open circuit (fuse) TCM Relay failure TCM Relay ground circuit:open circuit, high resistance TCM Relay supply circuits: open circuit (fuse) TCM Ground circuit: open circuit, high resistance

CAN open circuit fault CAN short circuit fault TCM failure

CAN open circuit fault – TCM to ECM CAN short circuit fault ECM failure TCM failure

CAN open circuit fault – Hold Switch Circuit Malfunction TCM to ABS/TC(SCCM) CAN short circuit fault ABS/TC (SCCM) failure TCM failure

DTC P0126 & DTC P0128 Code: Coolant thermostat stuck open DETECTION CONDITION DTC P0126 • If the ECT signal never exceeds 71°C {160 OF} after engine start for specified period, PCM determines that the coolant thermostat is stuck open. MONITORING CONDITIONS -IAT: above -10°C {14 OF} -Vehicle speed: over 6.0 km/h {3.7 mph} DTC P0128…

P0455 Evaporative emissions gross leak detected 1) Fuel filler cap missing or loose. 2) Fuel filler cap o-ring damaged or missing. 3) Faulty or damaged fuel filler pipe. 4) Leaking fuel vapor lines. 5) Improperly installed or leaking Purge Solenoid Valve (PSV). 6) Leaking canister or catch tank. 7) Leak Detection Pump (LDP) body leaking….

Mitsubishi P2195: Heated Oxygen Sensor Inactive (bank 1, sensor 1) DESCRIPTION The ECM effects air/fuel ratio feedback control in accordance with the signals from the right bank heater oxygen sensor (front). If the right bank heated oxygen sensor (front) has deteriorated, corrections will be made by the right bank heated oxygen sensor (rear). DTC P2195…

P0705 Code Definition Transmission Range Sensor Circuit Malfuntion (PRNDL input) Symptom Check Engine Light will illuminate Vehicle may not shift properly Vehicle may not go into gear Decrease in fuel economy In unusual cases, there are no adverse conditions noticed by the driver In some cases, there may be performance problems Possible Causes: Defective Transmission…

P0770 Code Definition Shift Solenoid E Malfunction (Lock-Up Converter Solenoid) What does this mean? The purpose of the Torque Converter Lockup Clutch is to create a 1 to 1 RPM ratio between the Transmission Input Shaft and the rotational speed of the Torque Converter so that a manual transmission-like, “mechanical lock” between the engine and the…

P0605 Code Definition: Internal Control Module Read Only Memory (ROM) Error What does this mean? The PCM or Power Train Control Module performs many vital functions in a modern vehicle, such as management of the Fuel System, Ignition System, Transmission, Anti-Lock Brake and Traction Control systems. The PCM regularly runs a self-diagnosis function where it…

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