Pinpoint Test A: The Pcm Does Not Respond To The Scan Tool
WARNING: This page is about a different car, the 2011 Ford Taurus. 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, BATTERY MOUNTING & BATTERY CABLES
Article.
NOTE:
Most faults are due to connector and/or wiring concerns. Carry out a thorough inspection and verification before proceeding with the Pinpoint Test.
- A1 VERIFY WHETHER OTHER HS-CAN MODULES PASS THE NETWORK TEST
- 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, APIM, C-CM, HUD module, IPC, OCSM, PAM, PCM, PSCM, RFA module or RCM?
- Yes
: If "pass" or a DTC was listed next to the PCM, a network fault is not currently present. GO to PINPOINT TEST AE 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 AD to diagnose no HS-CAN communication.
- A2 PC/ED PINPOINT TEST QA VERIFICATION
- Verify that INTRODUCTION - GASOLINE MODELS article 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 Article, , pinpoint test QA to diagnose no communication with the PCM.
- A3 CHECK THE HS-CAN TERMINATION RESISTANCE
- Ignition OFF.
- Disconnect: Negative Battery Cable.
- Disconnect the scan tool from the DLC.
- 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 HS-CAN CIRCUITS BETWEEN THE PCM AND THE DLC FOR AN OPEN - 3.5L
- Disconnect: PCM C175b.
- Measure the resistance between the PCM C175b-2, circuit VDB04 (WH/BU), harness side and the DLC C251-6, circuit VDB04 (WH/BU), harness side.
- Measure the resistance between the PCM C175b-3, 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 HS-CAN CIRCUITS BETWEEN THE PCM AND THE DLC FOR AN OPEN - 3.5L GTDI
- Disconnect: PCM C1381b.
- Measure the resistance between the PCM C1381b-59, circuit VDB04 (WH/BU), harness side and the DLC C251-6, circuit VDB04 (WH/BU), harness side.
- Measure the resistance between the PCM C1381b-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.
- 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 ENGINE CONTROLS - ELECTRONIC ENGINE CONTROLS Article. 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.