Signal Too High
Signal too high
DTC status ECM-1400 Manifold absolute pressure (MAP) sensor. Signal too high
Reading of DTC status ECM-1400
Note! When reading off the DTC status, other stored diagnostic trouble codes (DTCs) and their status will be listed.
- Read off the 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 connector
No - Intermittent fault
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Intermittent fault
Signal too high. Intermittent fault
Checking wiring and connectors
Check the reference voltage cable between control module connector terminal A58 (#A60) and manifold absolute pressure (MAP) sensor connector terminal 3 for an intermittent short-circuit to supply voltage according to Checking wiring and terminals. Intermittent faults Checking Wiring and Terminals. Intermittent Faults.
Hint: With the ignition on and the manifold absolute pressure (MAP) sensor connector disconnected, the voltage between terminal 3 and the ground terminal should be approximately 5V.
Check the signal cable between control module connector terminal A23 (#A23) and manifold absolute pressure (MAP) sensor connector terminal 1 for an intermittent open-circuit according to Checking wiring and terminals. Intermittent faults Checking Wiring and Terminals. Intermittent Faults. Also check for an intermittent short-circuit to supply voltage according to Checking wiring and terminals. Intermittent faults Checking Wiring and Terminals. Intermittent Faults.
Hint: With the ignition on and the manifold absolute pressure (MAP) sensor connector disconnected, the voltage between terminal 1 and the ground terminal should be approximately 5V.
Check the ground lead between control module connector terminal A61 (#B3) and manifold absolute pressure (MAP) sensor connector terminal 2 for an intermittent open-circuit according to Checking wiring and terminals. Intermittent faults Checking Wiring and Terminals. Intermittent Faults.
Other information:
- To connect the breakout box, see Connecting the breakout box Connecting the Breakout Box
- To access / replace the control module, see
- For information about signals, see Signal specification Signal Description / Specification
- To localize the manifold absolute pressure (MAP) sensor, see Location of components Locations.
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 wiring and connectors
FAULT FOUND - DONE
DONE - DONE
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DONE - DONE
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Checking connector
- Ignition off.
- Check manifold absolute pressure (MAP) sensor connector for contact resistance and oxidation according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Remedy as necessary.
Other information:
- For information about signals, see Signal specification Signal Description / Specification
- Manifold Absolute Pressure Sensor (MAP Sensor), table values, see Air pressure sensor intake manifold (MAP) [1][2]Manifold Pressure/Vacuum Sensor
- To localize the manifold absolute pressure (MAP) sensor, see Location of components Locations.
Continue - Checking manifold absolute pressure (MAP) sensor signal
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Checking manifold absolute pressure (MAP) sensor signal
- Ignition off.
- Reinstall components, reconnect connectors etc.
- Ignition on.
- Read off the manifold absolute pressure (MAP) sensor signal.
Check that the signal is within its permitted range. The manifold absolute pressure (MAP) sensor signal voltage is compared to the table value: Air pressure sensor intake manifold (MAP) [1][2]Manifold Pressure/Vacuum Sensor.
If signal is now OK this indicates that the fault was caused by poor contact in the connector.
Other information:
- For information about signals, see Signal specification Signal Description / Specification.
- Manifold Absolute Pressure Sensor (MAP Sensor), table values, see Air pressure sensor intake manifold (MAP) [1][2]Manifold Pressure/Vacuum Sensor.
Is the signal OK?
Yes - Verification
No - Checking wiring and components
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Checking wiring and components
Check reference voltage cable between control module connector #A58 (#A60) and mass air flow (MAF) connector terminal 3 for a short-circuit to supply voltage according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Hint: With the ignition on and manifold absolute pressure (MAP) sensor connector disconnected the voltage between terminal 3 and ground terminal should be approximately 5V.
Check signal cable between control module #A23 (#A23) and manifold absolute pressure (MAP) sensor connector terminal 1 for an open-circuit according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault , and a short-circuit to supply voltage according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Hint: With the ignition on and manifold absolute pressure (MAP) sensor connector disconnected the voltage between terminal 1 and ground terminal should be approximately 5V.
Check ground lead between control module #A61 (#B3) and manifold absolute pressure (MAP) sensor connector terminal 2 for an open-circuit according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
If wiring is OK, try a new manifold absolute pressure (MAP) sensor.
Remedy as necessary.
Other information:
- To connect the breakout box, see Connecting the breakout box Connecting the Breakout Box
- To access/replace the control module, see
- For information about signals, see Signal specification Signal Description / Specification
- To localize the manifold absolute pressure (MAP) sensor, see Location of components Locations.
Continue - Verification
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Verification
Verification
Verification
Hint: After carrying out the repair, check that the fault has been remedied.
- Ignition off.
- Reconnect connectors, reinstall components.
- Ignition on.
- Read off the manifold absolute pressure (MAP) sensor signal.
- Start the engine. Check that the signal varies (sinks) during acceleration.
Check that the signal is within its permitted range. The manifold absolute pressure (MAP) sensor voltage is compared to the table value: Air pressure sensor intake manifold (MAP) [1][2]Manifold Pressure/Vacuum Sensor
Check that the signal is OK.
Is the signal 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 - DTC status ECM-1400 Manifold absolute pressure (MAP) sensor. Signal too high
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