Test Procedure
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- Q1 PRELIMINARY DIAGNOSIS
- Carry out a visual inspection.
- Retrieve and record all DTCs.
- Record the freeze frame data.
- Clear the DTCs.
- Carry out the KOEO self-test.
Are any DTCs retrieved?
Yes No For DTC P2285, GO to Q2.
For DTC P2286, GO to Q6.
For DTC P2287, GO to Q13.GO to Q12. - Q2 DIAGNOSTIC TROUBLE CODE (DTC) P2285 NOTE: DTC P2285 indicates the injector control signal circuit out of range low was detected during the KOEO self-test or during continuous diagnostic monitoring.
- Possible causes:
- ICP signal circuit open
- ICP disconnected
- ICP signal circuit short to ground
- VREF circuit open
- biased ICP sensor
- ICP sensor
- PCM
- Key in OFF position.
- ICP Sensor connector disconnected.
- Key ON, engine OFF.
- Measure the voltage between:
( + ) ICP Sensor Connector, Harness Side ( - ) VREF - Pin 2 Ground
Is the voltage between 4.5 - 5.5 V?
Yes No GO to Q3. GO to Q9. - Possible causes:
- Q3 CHECK THE ICP SIGNAL CIRCUIT FOR A SHORT TO GROUND
- Key in OFF position.
- PCM connector disconnected.
- Measure the resistance between:
( + ) ICP Sensor Connector, Harness Side ( - ) ICP - Pin 3 Ground
Is the resistance greater than 10K ohms?
Yes No GO to Q4. REPAIR the short circuit. CLEAR the DTCs.
REPEAT the self-test. - Q4 CHECK THE ICP SIGNAL CIRCUIT FOR AN OPEN
- Measure the resistance between:
( + ) ICP Sensor Connector, Harness Side ( - ) PCM Connector, Harness Side ICP - Pin 3 CP - Pin E29
Is the resistance less than 5 ohms?
Yes No GO to Q5. REPAIR the open circuit. CLEAR the DTCs.
REPEAT the self-test. - Measure the resistance between:
- Q5 CHECK THE ICP SENSOR NOTE: This step may cause DTC P2286 to set.
- PCM connector connected.
- Key ON, engine OFF.
- Connect a 5 amp fused jumper wire between the following:
Point A ICP Sensor Connector, Harness Side Point B ICP Sensor Connector, Harness Side ICP - Pin 3 VREF - Pin 2 - Access the PCM and monitor the ICP_V PID.
Is the voltage between 4 - 5.5 V?
Yes No INSTALL a new ICP sensor. CLEAR the DTCs.
REPEAT the self-test.GO to Q12. - Q6 DIAGNOSTIC TROUBLE CODE (DTC) P2286
- Possible causes:
- signal circuit short to power
- SIGRTN open circuit
- PCM
- ICP sensor
- Key in OFF position.
- ICP Sensor connector disconnected.
- The ICP sensor is disconnected to simulate the opposite DTC.
- Key ON, engine OFF.
- Carry out the KOEO self-test.
Is DTC P2285 present?
Yes No INSTALL a new ICP sensor. CLEAR the DTCs.
REPEAT the self-test.GO to Q7. - Possible causes:
- Q7 CHECK THE ICP SENSOR SIGNAL FOR A SHORT TO VOLTAGE
- Key in OFF position.
- PCM connector disconnected.
- Key ON, engine OFF.
- Measure the voltage between:
( + ) ICP Sensor Connector, Harness Side ( - ) ICP - Pin 3 Ground
Is any voltage indicated?
Yes No REPAIR the short circuit. CLEAR the DTCs.
REPEAT the self-test.GO to Q8. - Q8 CHECK THE ICP SIGRTN CIRCUIT FOR AN OPEN
- Key in OFF position.
- Measure the resistance between:
( + ) ICP Sensor Connector, Harness Side ( - ) PCM Connector, Harness Side SIGRTN - Pin 1 SIGRTN - Pin E25
Is the resistance less than 5 ohms?
Yes No GO to Q12. REPAIR the open circuit. CLEAR the DTCs.
REPEAT the self-test. - Q9 CHECK THE VREF CIRCUIT FOR AN OPEN
- Key in OFF position.
- PCM connector disconnected.
- Measure the resistance between:
( + ) ICP Sensor Connector, Harness Side ( - ) PCM Connector, Harness Side VREF - Pin 2 VREF - Pin E36
Is the resistance less than 5 ohms?
Yes No GO to Q10. REPAIR the open circuit. CLEAR the DTCs.
REPEAT the self-test. - Q10 CHECK THE VREF CIRCUIT FOR A SHORT TO GROUND
Is the resistance greater than 10K ohms?
Yes No GO to Q12. REPAIR the short circuit. CLEAR the DTCs.
REPEAT the self-test. - Q11 CHECK THE ICP SENSOR FOR BIAS NOTE: Verify the engine oil temperature (EOT) is greater than 82°C (180°F).
- Key ON, engine OFF.
- Access the PCM and monitor the ICP_V PID.
Is the voltage between 0.15 - 0.35 V?
Yes No UNABLE to duplicate the condition. CHECK for a loose connection, and damaged or corroded terminals. WIGGLE the harness attempting to recreate the fault. REPAIR as necessary. REFER to SYMPTOM CHARTS , if a driveability concern exists. INSTALL a new ICP sensor. CLEAR the DTCs.
REPEAT the self-test. - Q12 CHECK FOR CORRECT PCM OPERATION
- Disconnect all the PCM connectors.
- Visually inspect for:
- pushed out pins
- corrosion
- Connect all the PCM connectors and make sure they seat correctly.
- Carry out the PCM self-test and verify the concern is still present.
Is the concern still present?
Yes No INSTALL a new PCM. REFER to FLASH ELECTRICALLY ERASABLE PROGRAMMABLE READ ONLY MEMORY (EEPROM) . The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. - Q13 ICP SENSOR INTERMITTENT CHECK
- Visually inspect the ICP sensor harness and connector for damage, corrosion, or incorrect routing.
- Access the PCM and monitor the ICP_V PID.
- While monitoring the ICP_V PID, wiggle, shake, and bend small sections of the wiring harness while working from the sensor to the PCM.
Is there any change in the ICP PID value, or is a concern present?
Yes No REPAIR as necessary. The system is operating correctly at this time.
The concern may have been caused by a loose or corroded connector.