Steps V1-V24
Communications Network
Pinpoint Tests
Pinpoint Test V: No High Speed Controller Area Network (HS-CAN) Communication, All Modules Are Not Responding
Refer to Wiring Diagram Set 14, Module Communications Network for schematic and connector information. Diagrams By Number
Refer to Wiring Diagram Set 25, Electronic Engine Controls - 6.8L for schematic and connector information. Diagrams By Number
Refer to Wiring Diagram Set 26, Electronic Engine Controls - 6.2L for schematic and connector information. Diagrams By Number
Refer to Wiring Diagram Set 27, Electronic Engine Controls - 6.7L Diesel for schematic and connector information. Diagrams By Number
Normal Operation
The High Speed Controller Area Network (HS-CAN) uses an unshielded twisted pair cable circuits HS-CAN (+) and HS-CAN (-).
This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- ABS module
- Instrument Panel Cluster (IPC)
- Accessory Protocol Interface Module (APIM) (if equipped)
- PCM
- Restraints Control Module (RCM)
- Auxiliary Heater Control Module (AHCM) (diesel engine only, if equipped)
- Trailer Brake Control (TBC) module (if equipped)
- Transmission Control Module (TCM) (diesel engine only, if equipped)
- Body Control Module (BCM)
- Parking Aid Module (PAM) (if equipped)
- Transfer Case Control Module (TCCM) (if equipped)
PINPOINT TEST V: NO HS-CAN COMMUNICATION, ALL MODULES ARE NOT RESPONDING
NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.
NOTE: Most faults are due to connector and/or wiring concerns. Carry out a thorough inspection and verification before proceeding with the pinpoint test. Inspection and Verification
NOTE: Failure to disconnect the battery when instructed will result in false resistance readings. Refer to Battery, Mounting and Cables Battery Disconnect / Connect.
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V1 CHECK THE DLC PINS FOR DAMAGE
- Ignition OFF.
- Disconnect the scan tool cable from the Data Link Connector (DLC).
- Inspect DLC pins 6 and 14 for damage.
- Are DLC pins 6 and 14 OK?
Yes
GO to V2.
No
REPAIR the DLC as necessary. CLEAR the DTCs. REPEAT the network test with the scan tool.
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V2 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?
Yes
GO to V3.
No
GO to V5.
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V3 CHECK THE HS-CAN (+) AND HS-CAN (-) CIRCUITS FOR A SHORT TO GROUND
- Measure the resistance between the DLC C251-6, circuit VDB04 (WH/BU), harness side and ground; and between the DLC C251-14, circuit VDB05 (WH), harness side and ground.
- Are the resistances greater than 1,000 ohms?
Yes
CONNECT the negative battery cable. GO to V4.
No
GO to V24.
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V4 CHECK THE HS-CAN (+) AND HS-CAN (-) CIRCUITS FOR A SHORT TO VOLTAGE
- Ignition ON.
- Measure the voltage between the DLC C251-6, circuit VDB04 (WH/BU), harness side and ground; and between the DLC C251-14, circuit VDB05 (WH), harness side and ground.
- Is the voltage greater than 6 volts?
Yes
REPAIR the circuit. CLEAR the DTCs. REPEAT the network test with the scan tool.
No
The HS-CAN has tested within specifications. GO to Pinpoint Test U to test for an intermittent network fault condition. Pinpoint Test U: Intermittent No High Speed Controller Area Network (HS-CAN) Communication, One Or More Modules Are Not Respond
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V5 CHECK THE HS-CAN TERMINATION RESISTOR
- 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 108 and 132 ohms?
Yes
GO to V6.
No
GO to V9.
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V6 CHECK THE HS-CAN TERMINATION RESISTOR WITH THE PCM DISCONNECTED
- Disconnect: PCM C175b (Gasoline Engine) or C1232b (Diesel Engine) .
- 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 108 and 132 ohms?
Yes
GO to V7.
No
GO to V8.
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V7 CHECK THE HS-CAN CIRCUITS BETWEEN THE PCM AND THE DLC FOR AN OPEN
- For gasoline engines, 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.
- For gasoline engines, measure the resistance between the PCM C175b-58, circuit VDB05 (WH), harness side and the DLC C251-14, circuit VDB05 (WH), harness side.
- For diesel engines, measure the resistance between the PCM C1232b-59, circuit VDB04 (WH/BU), harness side and the DLC C251-6, circuit VDB04 (WH/BU), harness side.
- For diesel engines, measure the resistance between the PCM C1232b-43, circuit VDB05 (WH), harness side and the DLC C251-14, circuit VDB05 (WH), harness side.
- Are the resistances less than 5 ohms?
Yes
GO to V37.
No
REPAIR the circuit in question. CLEAR the DTCs. REPEAT the network test with the scan tool.
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V8 CHECK THE HS-CAN CIRCUITS BETWEEN THE BCM AND THE DLC FOR AN OPEN
- Disconnect: BCM C2280f .
- Measure the resistance between the BCM C2280f-16, circuit VDB04 (WH/BU), harness side and the DLC C251-6, circuit VDB04 (WH/BU), harness side.
- Measure the resistance between the BCM C2280f-17, circuit VDB05 (WH), harness side and the DLC C251-14, circuit VDB05 (WH), harness side.
- Are the resistances less than 5 ohms?
Yes
GO to V43.
No
REPAIR the circuit in question. CLEAR the DTCs. REPEAT the network test with the scan tool.
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V9 CHECK THE HS-CAN (+) AND HS-CAN (-) CIRCUITS FOR A SHORT TOGETHER
- 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 less than 5 ohms?
Yes
GO to V11.
No
GO to V10.
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V10 CHECK THE HS-CAN CIRCUITS FOR AN OPEN AT 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 greater than 10,000 ohms?
Yes
REPAIR the DLC or REPAIR the circuit in question. CLEAR the DTCs. REPEAT the network test with the scan tool.
No
A capacitor internal to a module may still be draining causing irregular resistance readings. WAIT 5 minutes. REPEAT the pinpoint test.
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V11 CHECK THE HS-CAN (+) AND HS-CAN (-) CIRCUITS FOR A SHORT TOGETHER WITH THE PCM DISCONNECTED
- Disconnect: PCM C175b (Gasoline Engine) or C1232b (Diesel Engine) .
- 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 less than 5 ohms?
Yes
If the vehicle is equipped with a PAM, GO to V12.
If the vehicle is not equipped with a PAM, GO to V13.
No
CONNECT the negative battery cable. GO to V37.
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V12 CHECK THE HS-CAN (+) AND HS-CAN (-) CIRCUITS FOR A SHORT TOGETHER WITH THE PAM DISCONNECTED
- Disconnect: PAM C2023 .
- 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 less than 5 ohms?
Yes
GO to V13.
No
CONNECT the negative battery cable. GO to V38.
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V13 CHECK THE HS-CAN (+) AND HS-CAN (-) CIRCUITS FOR A SHORT TOGETHER WITH THE ABS MODULE DISCONNECTED
- Disconnect: ABS Module C135 .
- 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 less than 5 ohms?
Yes
If the vehicle is equipped with a TBC module, GO to V14.
If the vehicle is not equipped with a TBC module, GO to V15.
No
CONNECT all modules. CONNECT the negative battery cable. GO to V39.
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V14 CHECK THE HS-CAN (+) AND HS-CAN (-) CIRCUITS FOR A SHORT TOGETHER WITH THE TBC MODULE DISCONNECTED
- Disconnect: TBC Module C2142 .
- 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 less than 5 ohms?
Yes
GO to V15.
No
CONNECT all modules. CONNECT the negative battery cable. GO to V40.
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V15 CHECK THE HS-CAN (+) AND HS-CAN (-) CIRCUITS FOR A SHORT TOGETHER WITH THE RCM DISCONNECTED
- Disconnect: RCM C310b .
- 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 less than 5 ohms?
Yes
If the vehicle is equipped with an APIM, GO to V16.
If the vehicle is not equipped with an APIM, GO to V17.
No
CONNECT all modules. CONNECT the negative battery cable. GO to V41.
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V16 CHECK THE HS-CAN (+) AND HS-CAN (-) CIRCUITS FOR A SHORT TOGETHER WITH THE APIM DISCONNECTED
- Disconnect: APIM C2298 .
- 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 less than 5 ohms?
Yes
GO to V17.
No
CONNECT all modules. CONNECT the negative battery cable. GO to V42.
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V17 CHECK THE HS-CAN (+) AND HS-CAN (-) CIRCUITS FOR A SHORT TOGETHER WITH THE IPC DISCONNECTED
- Disconnect: IPC C220 .
- 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 less than 5 ohms?
Yes
GO to V18.
No
CONNECT all modules. CONNECT the negative battery cable. GO to V44.
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V18 CHECK THE HS-CAN (+) AND HS-CAN (-) CIRCUITS FOR A SHORT TOGETHER WITH THE SCCM DISCONNECTED
- Disconnect: SCCM C2414a .
- 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 less than 5 ohms?
Yes
If the vehicle is equipped with a TCCM GO to V19.
If the vehicle is not equipped with a TCCM GO to V20
No
CONNECT all modules. CONNECT the negative battery cable. GO to V47.
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V19 CHECK THE HS-CAN (+) AND HS-CAN (-) CIRCUITS FOR A SHORT TOGETHER WITH THE TCCM DISCONNECTED
- Disconnect: TCCM C2371a .
- 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 less than 5 ohms?
Yes
GO to V20.
No
CONNECT all modules. CONNECT the negative battery cable. GO to V48.
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V20 CHECK THE HS-CAN (+) AND HS-CAN (-) CIRCUITS FOR A SHORT TOGETHER WITH THE BCM DISCONNECTED
- Disconnect: BCM C2280f .
- 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 less than 5 ohms?
Yes
If the vehicle is equipped with a diesel engine, GO to V21.
If the vehicle is not equipped with a diesel engine, REPAIR the circuits. CONNECT all modules. CLEAR the DTCs. REPEAT the network test with the scan tool.
No
CONNECT all modules. CONNECT the negative battery cable. GO to V43.
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V21 CHECK THE HS-CAN (+) AND HS-CAN (-) CIRCUITS FOR A SHORT TOGETHER WITH THE TCM DISCONNECTED
- Disconnect: TCM C1750 .
- 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 less than 5 ohms?
Yes
GO to V22.
No
CONNECT all modules. CONNECT the negative battery cable. GO to V45.
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V22 VERIFY VEHICLE EQUIPMENT - AHCM
- Verify whether the vehicle is equipped with a Auxiliary Heater Control Module (AHCM).
- Is the vehicle equipped with an AHCM?
Yes
GO to V23.
No
REPAIR the circuits. CONNECT all modules. CLEAR the DTCs. REPEAT the network test with the scan tool.
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V23 CHECK THE HS-CAN (+) AND HS-CAN (-) CIRCUITS FOR A SHORT TOGETHER WITH THE AHCM DISCONNECTED
- Disconnect: AHCM C2463b .
- 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 less than 5 ohms?
Yes
REPAIR the circuits. CONNECT all modules. CLEAR the DTCs. REPEAT the network test with the scan tool.
No
CONNECT all modules. CONNECT the negative battery cable. GO to V46.
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V24 CHECK THE HS-CAN (+) AND HS-CAN (-) CIRCUITS FOR A SHORT TO GROUND WITH THE PCM DISCONNECTED
- Disconnect: PCM C175b (Gasoline Engine) or C1232b (Diesel Engine) .
- Measure the resistance between the DLC C251-6, circuit VDB04 (WH/BU), harness side and ground; and between the DLC C251-14, circuit VDB05 (WH), harness side and ground.
- Are the resistances greater than 5,000 ohms?
Yes
CONNECT the negative battery cable. GO to V37.
No
If the vehicle is equipped with a PAM, GO to V25. If the vehicle is not equipped with a PAM, GO to V26.
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