Signal Too Low
Signal too low
Status check
Reading off the status of the diagnostic trouble code (DTC)
Engine control module (ECM)
Reading off the status of the diagnostic trouble code (DTC):
Note! When reading off the DTC status, other stored diagnostic trouble codes (DTCs) and their status will also be listed.
- Start the engine. Let it idle for at least 15 seconds.
- 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) permanent?
Yes - PERMANENT
No - INTERMITTENT
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PERMANENT - Checking the wiring and component
INTERMITTENT - Intermittent fault
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Checking the wiring and component
Check the signal cable between control module terminal #B3 (#B41) and fuel tank pressure sensor connector terminal #2 for a short-circuit to ground according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Check the signal cable between control module terminal #B10 (#B20) and fuel tank pressure sensor connector terminal #3 for a short-circuit to ground according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Remedy as necessary.
Other information:
- To connect the engine control module (ECM) breakout box, see Connecting the breakout box Connecting the Breakout Box
- To access or replace the fuel tank pressure sensor see
- The fuel tank pressure sensor terminal #3 is supplied with approximately 5V. Connector terminal #1 is the ground terminal and connector terminal #2 is the signal
- For information about signals, see Signal specification Signal Description / Specification.
Continue - Verification
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Intermittent fault
Signal too low. Intermittent fault
Checking wiring and connectors
Hint: This diagnostic trouble code (DTC) may also be caused by a clogged EVAP canister shut-off valve. If there are no electrical faults, a quick test of the fuel tank system can be carried out from vehicle communication.
Check the fuel tank pressure sensor connector for contact resistance and oxidation according to Checking wiring and terminals. Intermittent faults Checking Wiring and Terminals. Intermittent Faults.
Check the signal cable between engine control module (ECM) connector terminal #B31 (#B41) and fuel tank pressure sensor connector terminal #2 for an intermittent short-circuit to ground according to Checking wiring and terminals. Intermittent faults Checking Wiring and Terminals. Intermittent Faults.
Check the signal cable between engine control module (ECM) connector terminal #B10 (#B20) and fuel tank pressure sensor connector terminal #3 for an intermittent short-circuit to ground according to Checking wiring and terminals. Intermittent faults Checking Wiring and Terminals. Intermittent Faults.
Other information:
- To connect the engine control module (ECM) breakout box, see Connecting the breakout box Connecting the Breakout Box
- To access or replace the fuel tank pressure sensor see
- The fuel tank pressure sensor terminal #3 is supplied with approximately 5V. Connector terminal #1 is the ground terminal and connector terminal #2 is the signal
- 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 wiring and connectors
FAULT FOUND - DONE
DONE - DONE
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DONE - DONE
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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.
- Read off fuel tank pressure.
- Start the engine and let it idle.
- Activate the EVAP canister shut-off valve and allow it to open.
Activate canister purge (CP) valve. Open and shut the valve. Read off the fuel tank pressure and check if the values have changed.
Hint: When the canister purge (CP) valve is open the pressure in the fuel tank drops.
Note! If the EVAP canister is full the engine may stop when canister purge (CP) valve activation occurs because of the extra fuel supply.
Does the fuel tank pressure change?
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 - FAULT-TRACING FAILED
No - Attempt New Test
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Attempt New Test - Status check
FAULT-TRACING FAILED - FAULT-TRACING FAILED
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