Pinpoint Test A: The Pcm Does Not Respond To The Scan Tool
WARNING: This page is about a different car, the 2010 Mercury Mariner and 2010 Ford Escape. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.
NOTE:
Failure to disconnect the battery when instructed will result in false resistance readings. Refer to
BATTERY, MOUNTING AND CABLES
.
- A1 VERIFY WHETHER OTHER HS-CAN MODULES PASS THE NETWORK TEST
- Ignition ON.
- Enter the following diagnostic mode on the scan tool: Network Test.
- In the LH pane of the Integrated Diagnostic System (IDS) network test display screen, verify whether any HS-CAN modules passed the network test.
- Is the text "pass" or a DTC listed next to any of the following modules (if equipped): 4x4 control module, ABS module, Accessory Protocol Interface Module (APIM), Battery Control Module (BCM), Instrument Cluster (IC), Occupant Classification System Module (OCSM), Parking Aid Module (PAM), Power Steering Control Module (PSCM), Restraints Control Module (RCM), Transmission Control Module (TCM) or PCM?
- Yes:
If "pass" or a DTC was listed next to the PCM, a network fault is not currently present. GO to PINPOINT TEST R to diagnose an intermittent HS-CAN
fault condition.
If "pass" or a DTC was listed next to one or more modules other than the PCM, GO to A2 .
- No: No modules are currently communicating on the HS-CAN . GO to PINPOINT TEST T to diagnose no HS-CAN communication.
- A2 VERIFY THE PC/ED MANUAL PINPOINT TEST QA HAS BEEN CARRIED OUT
- Verify that pinpoint test QA has been carried out.
- Has pinpoint test QA been carried out?
- Yes: GO to A3 .
- No: REFER to the INTRODUCTION - GASOLINE MODELS , Section 5 , pinpoint test QA to diagnose no communication with the PCM.
- A3 CHECK THE HS-CAN TERMINATION RESISTANCE
- Ignition OFF.
- Disconnect: Negative Battery Cable.
- Measure the resistance between the DLC C251-6, circuit VDB04 (WH/BU), harness side and the DLC C251-14, circuit VDB05 (WH), harness side.
- Is the resistance between 54 and 66 ohms?
- A4 CHECK THE CAN CIRCUITS BETWEEN THE PCM AND THE DLC FOR AN OPEN - NON-HYBRID
- Measure the resistance between the PCM C175b-59, circuit VDB04 (WH/BU), harness side and the DLC C251-6, circuit VDB04 (WH/BU), harness side.
- Measure the resistance between the PCM C175b-58, circuit VDB05 (WH), harness side and the DLC C251-14, circuit VDB05 (WH), harness side.
- Are the resistances less than 5 ohms?
- Yes: CONNECT the negative battery cable. GO to A6.
- No: REPAIR the circuit in question. CONNECT the negative battery cable. CLEAR the DTCs. REPEAT the network test with the scan tool.
- A5 CHECK THE CAN CIRCUITS BETWEEN THE PCM AND THE DLC FOR AN OPEN - HYBRID
- Measure the resistance between the PCM C175b-59, circuit VDB04 (WH/BU), harness side and the DLC C251-6, circuit VDB04 (WH/BU), harness side.
- Measure the resistance between the PCM C175b-43, circuit VDB05 (WH), harness side and the DLC C251-14, circuit VDB05 (WH), harness side.
- Are the resistances less than 5 ohms?
- Yes: CONNECT the negative battery cable. GO to A6 .
- No: REPAIR the circuit in question. CONNECT the negative battery cable. CLEAR the DTCs. REPEAT the network test with the scan tool.
- A6 CHECK FOR CORRECT PCM OPERATION
- Disconnect all the PCM connectors.
- Check for:
- corrosion
- damaged pins
- pushed-out pins
- Connect all the PCM connectors and make sure they seat correctly.
- Operate the system and verify the concern is still present.
- Is the concern still present?
- Yes: INSTALL a new PCM. REFER to ELECTRONIC ENGINE CONTROLS - 2.5L or ELECTRONIC ENGINE CONTROLS - 3.0L (4V) . CONNECT all modules. CLEAR the DTCs. REPEAT the network test with the scan tool.
- No: The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CONNECT all modules.