Signal Too High
Signal too high
Diagnostic trouble code (DTC) status ECM-8400 5 volt power supply. Signal too high
Reading off Diagnostic trouble code (DTC) status ECM-8400
Note! When reading off the Diagnostic trouble code (DTC) status, other stored diagnostic trouble codes (DTCs) and their status will be listed.
- Read off the Diagnostic trouble code (DTC) status. Check the status of the relevant Diagnostic Trouble Code (DTC).
Was the status of the relevant Diagnostic Trouble Code (DTC) displayed as permanent?
Yes - Checking charge voltage
No - Intermittent fault
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Intermittent fault
Signal too high. Intermittent fault
Checking cables
Check cables between
- control module #A57 and camshaft position (CMP) sensor #1
- control module #A58 and manifold absolute pressure (MAP) sensor #3
- control module #A58 and air conditioning (A/C) pressure sensor #3
- control module #B10 and fuel tank pressure sensor #3
for an intermittent short-circuit to supply voltage according to Checking wiring and terminals. Intermittent faults Checking Wiring and Terminals. Intermittent Faults.
Other information
- Connecting the breakout box/accessing the control module, see Connecting the breakout box Connecting the Breakout Box.
- To access/replace the control module, see the relevant service procedure.
- To access/replace the camshaft position (CMP) sensor, see Replacing camshaft position sensor (CMP) Service and Repair.
- To access/replace manifold absolute pressure (MAP) sensor, see Mass air flow (MAF) sensor, replacing Service and Repair.
- To access/replace air conditioning (A/C) pressure sensor, see the relevant service procedure.
- To access/replace the fuel tank pressure sensor see the relevant service procedure.
- For information about signals, see Signal specification Signal Description / Specification.
Continue - Fault-tracing information
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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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Attempt New Test - Checking cables
FAULT FOUND - DONE
DONE - DONE
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DONE - DONE
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Checking charge voltage
Note! The 5 volt supply for the various components is common internally in the control module. Therefore the control module cannot identify which of the outputs are short-circuited to supply voltage. Consequently all the affected outputs must be checked for a short-circuit to supply voltage.
Check cables between
- control module #A57 and camshaft position (CMP) sensor #1
- control module #A58 and manifold absolute pressure (MAP) sensor #3
- control module #A58 and air conditioning (A/C) pressure sensor #3
- control module #B10 and fuel tank pressure sensor #3
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
- Connecting the breakout box/accessing the control module, see Connecting the breakout box Connecting the Breakout Box.
- To access/replace the control module, see the relevant service procedure.
- To access/replace the camshaft position (CMP) sensor, see Replacing camshaft position sensor (CMP) Service and Repair.
- To access/replace manifold absolute pressure (MAP) sensor, see Mass air flow (MAF) sensor, replacing Service and Repair.
- To access/replace air conditioning (A/C) pressure sensor, see the relevant service procedure.
- To access/replace the fuel tank pressure sensor see the relevant service procedure.
- For information about signals, see Signal specification Signal Description / Specification.
Continue - Verification
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Verification
Verification
Verification
Hint: After carrying out the repair, check that the fault has been remedied.
- Ignition off.
- Reinstall connectors, components etc.
- Ignition on.
Read off the 5 volt power supply to the sensors.
Is the voltage OK?
Yes - VERIFIED
No - VERIFICATION FAILED
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VERIFICATION FAILED - Fault-tracing information
VERIFIED - Fault Found
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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 - FAULT-TRACING FAILED
No - Attempt New Test
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FAULT-TRACING FAILED - FAULT-TRACING FAILED
Attempt New Test - Diagnostic trouble code (DTC) status ECM-8400 5 volt power supply. Signal too high
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