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Communication - Non-Dtc Based Diagnostics: Diagnosis RAM Cab & Chassis 3500 HD

Communication Devices 1 illustration ~1803 words

DIAGNOSTIC CAN C (+) AND/OR DIAGNOSTIC CAN C (-) CIRCUITS HIGH

For a complete wiring diagram, refer to appropriate SYSTEM WIRING DIAGRAMS article .

DIAGNOSTIC CAN C (+) CIRCUIT LOW

For a complete wiring diagram, refer to appropriate SYSTEM WIRING DIAGRAMS article .

DIAGNOSTIC CAN C (+) CIRCUIT OPEN

For a complete wiring diagram, refer to appropriate SYSTEM WIRING DIAGRAMS article .

DIAGNOSTIC CAN C (-) CIRCUIT LOW

For a complete wiring diagram, refer to appropriate SYSTEM WIRING DIAGRAMS article .

DIAGNOSTIC CAN C (-) CIRCUIT OPEN

For a complete wiring diagram, refer to appropriate SYSTEM WIRING DIAGRAMS article .

DIAGNOSTIC CAN C (+) SHORTED TO DIAGNOSTIC CAN C (-)

For a complete wiring diagram, refer to appropriate SYSTEM WIRING DIAGRAMS article .

DIAGNOSTIC TEST

  1. TEST FOR INTERMITTENT CONDITION NOTE: Check for any TSB(s) related to the condition. If a TSB applies, perform the procedure outlined in the TSB before continuing. Turn the ignition on. NOTE: Make sure the IOD fuse is installed and battery voltage is between 10.0 and 16.0 volts. With the scan tool, read the module status. NOTE: Check the TIPM for any active CAN hardware DTCs, perform DTC before proceeding. Does the scan tool indicate that the module is active on the bus? Yes Test complete, the condition or conditions that originally set this DTC are not present at this time. Using the wiring diagrams as a guide, check all related splices and connectors for signs of water intrusion, corrosion, pushed out or bent terminals, and correct pin tension. No Go To 2 .
  2. (A910/A118) FUSED B(+) CIRCUITS OPEN OR SHORTED Turn the ignition off. Disconnect the PCM C2 harness connector. Using a 12-volt test light connected to ground, check the (A910/A118) Fused B(+) circuits. Does the test light illuminate brightly for each circuit? Yes Go To 3 . No Repair the open or short in the (A910/A118) Fused B(+) circuit. Refer to «3500 CAB & CHASSIS - POWERTRAIN VERIFICATION TEST»(ref-476607-S38255705622012060400000) or «3500 CAB & CHASSIS, 4500 & 5500 - POWERTRAIN VERIFICATION TEST - 6.7L»(ref-476635-S37546799742012060400000) and perform the POWERTRAIN VERIFICATION TEST - 6.7L.
  3. (Z915) GROUND CIRCUITS OPEN Using a 12-volt test light connected to 12-volts, check the (Z915) Ground circuits. Does the test light illuminate brightly for each circuit? Yes Go To 4 . No Repair the open in the (Z915) Ground circuit. Refer to «3500 CAB & CHASSIS - POWERTRAIN VERIFICATION TEST»(ref-476607-S38255705622012060400000) or «3500 CAB & CHASSIS, 4500 & 5500 - POWERTRAIN VERIFICATION TEST - 6.7L»(ref-476635-S37546799742012060400000) and perform the POWERTRAIN VERIFICATION TEST - 6.7L.
  4. (F202) IGNITION RUN/START CONTROL OUTPUT CIRCUIT OPEN OR SHORTED Turn the ignition on. Using a 12-volt test light connected to ground, check the (F202) Ignition Run/Start Control Output circuit. Does the test light illuminate brightly? Yes Go To 5 . No Repair the open or short in the (F202) Ignition Run/Start Control Output circuit. Refer to «3500 CAB & CHASSIS - POWERTRAIN VERIFICATION TEST»(ref-476607-S38255705622012060400000) or «3500 CAB & CHASSIS, 4500 & 5500 - POWERTRAIN VERIFICATION TEST - 6.7L»(ref-476635-S37546799742012060400000) and perform the POWERTRAIN VERIFICATION TEST - 6.7L.
  5. (F1) IGNITION SWITCH OUTPUT (OFF-RUN-START) CIRCUIT OPEN OR SHORTED Using a 12-volt test light connected to ground, check the (F1) Ignition Switch Output (Off-Run-Start) circuit. Does the test light illuminate brightly? Yes Go To 6 . No Repair the open or short in the (F1) Ignition Switch Output (Off-Run-Start) circuit. Refer to «3500 CAB & CHASSIS - POWERTRAIN VERIFICATION TEST»(ref-476607-S38255705622012060400000) or «3500 CAB & CHASSIS, 4500 & 5500 - POWERTRAIN VERIFICATION TEST - 6.7L»(ref-476635-S37546799742012060400000) and perform the POWERTRAIN VERIFICATION TEST - 6.7L.
  6. (D65) CAN C BUS (+) CIRCUIT OPEN Turn the ignition off. Disconnect the TIPM C1 harness connector. Measure the resistance of the (D65) CAN C Bus (+) circuit between the TIPM C1 harness connector and the PCM C2 harness connector. Is resistance below 5.0 Ohms? Yes Go To 7 . No Repair the open in the (D65) CAN C Bus (+) circuit. Refer to «3500 CAB & CHASSIS - POWERTRAIN VERIFICATION TEST»(ref-476607-S38255705622012060400000) or «3500 CAB & CHASSIS, 4500 & 5500 - POWERTRAIN VERIFICATION TEST - 6.7L»(ref-476635-S37546799742012060400000) and perform the POWERTRAIN VERIFICATION TEST - 6.7L.
  7. (D64) CAN C BUS (-) CIRCUIT OPEN Measure the resistance of the (D64) CAN C Bus (-) circuit between the TIPM C1 harness connector and the PCM C2 harness connector. Is resistance below 5.0 Ohms? Yes Replace the PCM in accordance with the Service Information. Refer to «MODULE, POWERTRAIN CONTROL, REMOVAL»(ref-476533-S29192226892012060400000) or «MODULE, POWERTRAIN CONTROL, 6.7L DIESEL [ETJ], REMOVAL»(ref-476533-S09065799022012060400000) . Refer to «3500 CAB & CHASSIS - POWERTRAIN VERIFICATION TEST»(ref-476607-S38255705622012060400000) or «3500 CAB & CHASSIS, 4500 & 5500 - POWERTRAIN VERIFICATION TEST - 6.7L»(ref-476635-S37546799742012060400000) and perform the POWERTRAIN VERIFICATION TEST - 6.7L. No Repair the open in the (D64) CAN C Bus (-) circuit. Refer to «3500 CAB & CHASSIS - POWERTRAIN VERIFICATION TEST»(ref-476607-S38255705622012060400000) or «3500 CAB & CHASSIS, 4500 & 5500 - POWERTRAIN VERIFICATION TEST - 6.7L»(ref-476635-S37546799742012060400000) and perform the POWERTRAIN VERIFICATION TEST - 6.7L.
  1. TEST FOR INTERMITTENT CONDITION Turn the ignition on. NOTE: Make sure the IOD fuse is installed and battery voltage is between 10.0 and 16.0 volts. NOTE: Make sure the scan tool is updated to the latest software. NOTE: If the scan tool displays any error messages involving the Diagnostic CAN C circuits, diagnose and repair the error message before proceeding. With the scan tool, attempt to communicate with the TIPM. Does the scan tool communicate with the TIPM? Yes The no response condition is not present at this time. Using the wiring diagram/schematic as a guide, inspect the wiring for chafed, pierced, pinched, and partially broken wires and the wiring harness connectors for broken, bent, pushed out, and corroded terminals. No Go To 2 .
  2. FUSED B(+) CIRCUITS OPEN AT TIPM Disconnect the scan tool from the DLC. Using a 12-volt test light connected to ground, and using the wiring diagram as a guide, check all Fused B(+) circuits at the TIPM. Does the test light illuminate brightly for each circuit? Yes Go To 3 . No Repair the open or short in the Fused B(+) circuit. Refer to «STANDARD PROCEDURE»(ref-476553-S41784775912012060400000) and perform the BODY VERIFICATION TEST.
  3. FUSED IGNITION SWITCH OUTPUT CIRCUITS OPEN AT TIPM Turn the ignition on. Using a 12-volt test light connected to ground, and using the wiring diagram as a guide, check each Fused Ignition Switch Output circuit at the TIPM. Does the test light illuminate brightly for each circuit? Yes Go To 4 . No Repair the open in the Fused Ignition Switch Output circuit. Refer to «STANDARD PROCEDURE»(ref-476553-S41784775912012060400000) and perform the BODY VERIFICATION TEST.
  4. GROUND CIRCUITS OPEN AT TIPM Turn the ignition off. Using a 12-volt test light connected to 12-volts, and using the wiring diagram as a guide, check all ground circuits at the TIPM. Does the test light illuminate brightly on each circuit? Yes Go To 5 . No Repair the open in the ground circuit that did not light the test light. Refer to «STANDARD PROCEDURE»(ref-476553-S41784775912012060400000) and perform the BODY VERIFICATION TEST.
  5. CHECK THE (D72) DIAGNOSTIC CAN C (+) CIRCUIT FOR AN OPEN Disconnect the TIPM C7 harness connector. Measure the resistance of the (D72) Diagnostic CAN C (+) circuit between the TIPM C7 harness connector and the DLC. Is the resistance below 5.0 Ohms? Yes Go To 6 . No Repair the open in the (D72) Diagnostic CAN C (+) circuit. Refer to «STANDARD PROCEDURE»(ref-476553-S41784775912012060400000) and perform the BODY VERIFICATION TEST.
  6. CHECK THE (D71) DIAGNOSTIC CAN C (-) CIRCUIT FOR AN OPEN Measure the resistance of the (D71) Diagnostic CAN C (-) circuit between the TIPM C7 harness connector and the DLC. Is the resistance below 5.0 Ohms? Yes Go To 7 . No Repair the open in the (D71) Diagnostic CAN C (-) circuit. Refer to «STANDARD PROCEDURE»(ref-476553-S41784775912012060400000) and perform the BODY VERIFICATION TEST.
  7. CHECK THE DIAGNOSTIC CAN C CIRCUITS FOR A SHORT TOGETHER Measure the resistance between the (D72) Diagnostic CAN C (+) circuit and the (D71) Diagnostic CAN C (-) circuit at the TIPM C7 harness connector. Is the resistance above 10k Ohms? Yes Replace the Totally Integrated Power Module in accordance with the Service Information. Refer to «MODULE, TOTALLY INTEGRATED POWER (TIPM), REMOVAL»(ref-476543-S26517536562012060400000) . Refer to «STANDARD PROCEDURE»(ref-476553-S41784775912012060400000) and perform the BODY VERIFICATION TEST. No Repair the short between the (D72) Diagnostic CAN C (+) circuit and the (D71) Diagnostic CAN C (-) circuit. Refer to «STANDARD PROCEDURE»(ref-476553-S41784775912012060400000) and perform the BODY VERIFICATION TEST.

Scheme 2

Scheme 2: NO RESPONSE FROM TPM (TIRE PRESSURE MONITORING) MODULE
Scheme 2: NO RESPONSE FROM TPM (TIRE PRESSURE MONITORING) MODULE

For a complete wiring diagram, refer to appropriate SYSTEM WIRING DIAGRAMS article .

  1. VERIFY DIAGNOSTIC TROUBLE CODE (DTC) IS STORED NOTE: Stored faults may indicate a customer perceived intermittent condition. NOTE: Make sure the IOD fuse is installed and battery voltage is between 10 and 16 volts before proceeding. Turn the ignition on. With the scan tool, read stored DTCs. Is this DTC stored? Yes Go To 2 . No Refer to «DIAGNOSIS AND TESTING»(ref-476525-S20739439882012060400000) and perform the appropriate diagnostic procedure.
  2. CHECK THE ENVIRONMENTAL DATA With the scan tool, read the loss of communication environmental data. Does the loss of communication environmental odometer data match up to any of the previous service procedures listed in the possible causes or are there any stored CAN C hardware electrical, battery, ignition voltage, VIN missing/mismatch, or TIPM configuration DTCs present with matching environmental data? Yes These DTCs may have been the result of other service procedures performed. Clear the DTCs. Refer to «STANDARD PROCEDURE»(ref-476553-S41784775912012060400000) and perform the BODY VERIFICATION TEST. No Go To 3 .
  3. VERIFY INTERMITTENT LOST COMMUNICATION DTC - WIRING CONCERNS With the scan tool, read all DTCs. Is there more than one ECU with stored DTCs "Logged Against" the module and one or more lost communication DTCs stored in the offending module? Yes Verify if the vehicle was recently in for this type of service. Otherwise, using the wiring diagrams as a guide, check all related splices and connectors for signs of water intrusion, corrosion, pushed out or bent terminals, and correct pin tension. Repair as necessary. No Go To 4 .
  4. VERIFY INTERMITTENT LOST COMMUNICATION DTC - OFFENDING MODULE With the scan tool, read all DTCs. Is there more than one ECU with stored DTCs "Logged Against" the module and NO lost communication DTCs stored in the offending module? Yes Check for a TSB related to this offending module. No Go To 5 .
  5. VERIFY INTERMITTENT LOST COMMUNICATION DTC - REPORTING MODULE With the scan tool, read all DTCs. Is there ONLY ONE ECU with stored DTCs "Logged Against" the module? Yes Check for a TSB related to the module that set this DTC. No Verify if the vehicle was recently in for this type of service. Otherwise, using the wiring diagrams as a guide, check all related splices and connectors for signs of water intrusion, corrosion, pushed out or bent terminals, and correct pin tension. Repair as necessary.

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