Faulty
Faulty
Connecting the breakout box
Checking the ground terminals
951 1373 Adaptor 951 1373 Adaptor 981 3190 Replaced by 9511428 981 3190 Replaced by 951 1428
Connecting the breakout box
Information
Connecting up the Test box
Is the test box connected to the control module?
Yes - CONNECTED
No - NOT CONNECTED
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CONNECTED - No Fault Found
NOT CONNECTED - Connecting the breakout box
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Connecting the breakout box
Connect the breakout box.
Continue - Checking the ground terminal
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Checking the ground terminal
- Ignition off.
- Control module disconnected.
- Switch off all equipment that takes power from the battery (courtesy lighting, radio etc).
Connect an ohmmeter between terminal #3 on the breakout box and the battery negative terminal.
The ohmmeter should read approximately 0 ohms.
OK - Return to the fault-tracing procedure where it was interrupted.
No Fault Found
Not OK - Checking for open-circuits, contact resistance and oxidation
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Checking for open-circuits, contact resistance and oxidation
Check the heater ground terminal and cables for an open-circuit according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault , check for contact resistance and oxidation according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Continue - Verification
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Verification
Verification
- Ignition off.
- Control module disconnected.
- Switch off all equipment that takes power from the battery (courtesy lighting, radio etc).
Connect an ohmmeter between #3 on the breakout box and battery negative terminal.
The ohmmeter should read approximately 0 ohms.
OK - VERIFIED
Not OK - VERIFICATION FAILED
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VERIFIED - FAULT FOUND
VERIFICATION FAILED - Fault-tracing information
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Fault-tracing information
Information
Fault-tracing information
The fault should be diagnosed and remedied. Since this is not the case the fault-tracing process has failed.
Complete the fault-tracing for those fault or try again.
Do you want to terminate fault-tracing at this time?
Yes - Exit fault-tracing
No - Attempt New Test
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Attempt New Test - Connecting the breakout box
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No Fault Found - Checking power supply
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Checking power supply
- Ignition on.
- Connect a voltmeter between #11 and #3 on the breakout box.
The voltmeter should read approximately 0 V.
Does the voltmeter read approximately 0 V?
Yes - Intermittent fault
No - Checking supply circuit
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Checking supply circuit
Hint: The fuel pump (FP) is installed in the fuel tank instead of on the heater when the Additional Heater is also used as a parking heater.
- Ignition off.
- Remove heater according to Replacing heat exchanger Service and Repair.
Check circuit between control module #11 and the components which are connected to the supply circuit (water pump terminal 2, fuel pump (FP) terminal 2 and combustion fan supply terminal) for a short-circuit to supply voltage according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Remedy as necessary.
Other information:
- To access the control module/connect breakout box see Pinout Values and Diagnostic Parameters.
- To access/replace the water pump see Replacing the water pump Replacing The Water Pump.
- To access/replace fuel pump (FP) see Replacing the fuel pump Service and Repair.
- To access/replace the blower fan see Replacing fuel injection nozzle, fan motor and nozzle pipe Service and Repair.
- With ignition on and water pump connector disconnected the voltage between the water pump terminal 1 (engine control module (ECM) side) and ground should be approximately 0 V.
- For other values, see Signal specification Additional heater 912-D/B Signal Specification Additional Heater 912-D/B.
Continue - Verification
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Verification
Verification
Hint: After carrying out the repair, check that the fault has been remedied.
- Ignition off.
- Breakout box connected.
- Reinstall connectors, components etc.
- Ignition on.
- Connect a voltmeter between #11 and #3 on the breakout box.
The voltmeter should read approximately 0 V
Does the voltmeter read approximately 0 V?
Yes - VERIFIED
No - VERIFICATION FAILED
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VERIFIED - FAULT FOUND
VERIFICATION FAILED - Fault-tracing information
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Fault-tracing information
Information
Fault-tracing information
The fault should have been detected and remedied. As this is not the case fault-tracing has failed.
Exit fault-tracing for this diagnostic trouble code (DTC) or make another attempt.
Do you want to exit fault-tracing?
Yes - Exit fault-tracing
No - Attempt New Test
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Attempt New Test - Connecting the breakout box
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Intermittent fault
Hint: The fuel pump (FP) is installed in the fuel tank instead of on the heater when the Additional Heater is also used as a parking heater.
Check circuit between control module #11 and components which are connected to supply voltage (water pump terminal 2, fuel pump (FP) terminal 1 and combustion fan supply terminal) for an intermittent short-circuit to supply voltage according to Checking wiring and terminals. Intermittent faults Checking Wiring and Terminals. Intermittent Faults.
Remedy as necessary.
Other information:
- To access the control module/connect breakout box see Pinout Values and Diagnostic Parameters.
- To access/replace the water pump see Replacing the water pump Replacing The Water Pump.
- To access/replace fuel pump (FP) see Replacing the fuel pump Service and Repair.
- To access/replace the blower fan see Replacing fuel injection nozzle, fan motor and nozzle pipe Service and Repair.
- With ignition on and water pump connector disconnected the voltage between the water pump terminal 1 (engine control module (ECM) side) and ground should be approximately 0 V.
- For other values, see Signal specification Additional heater 912-D/B Signal Specification Additional Heater 912-D/B.
Continue - Fault-tracing information
DONE
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Fault-tracing information
Information
Fault-tracing information
If the fault is intermittent, do not verify fault-tracing if the fault does not recur.
It is possible to view the information again, or leave fault-tracing for this diagnostic trouble code (DTC).
Do you want to view the information again?
Yes - Attempt New Test
No - FAULT FOUND
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FAULT-TRACING FAILED - DONE
Attempt New Test - Connecting the breakout box
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