Part 1
Signal too low. Permanent fault
EFI-621 Fuel tank pressure sensor, signal
Identification
First read Identifying cars constructed according to ORVR Application and ID.
Is the car constructed according to ORVR?
Yes - Safety
No - Signal too low. Permanent fault
-------------------------------------------------
Signal too low. Permanent fault
EFI-621 Fuel tank pressure sensor, signal
Checking power cable
- Ignition off.
- Wait for approximately 150 seconds (cars with immobilizer 245 seconds).
- Disconnect tank pressure sensor.
Connect an ohmmeter between fuel tank pressure sensor connector terminal 1 (engine control module (ECM) side) and ground.
The ohmmeter should read approximately 0.9 kohms.
OK -
Not OK -
------------------------
Checking power cable resistance
- Ignition off.
- Tank pressure sensor disconnected.
Connect an ohmmeter between fuel tank pressure sensor connector terminal 1 (engine control module (ECM) side) and ground.
The ohmmeter should read infinite resistance.
OK -
Not OK -
------------------------
Checking connector 24/4
- Ignition off.
- Tank pressure sensor disconnected.
- Check connector 24/4 for contact resistance and oxidation and remedy according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
- Assemble connector 24/4.
Connect an ohmmeter between fuel tank pressure sensor connector terminal 1 (engine control module (ECM) side) and ground.
The ohmmeter should read approximately 0.9 kohms.
OK -
Not OK -
------------------------
Fault-tracing information
- The diagnostic trouble code (DTC) has been caused by loose connections in connector 24/4.
Continue -
------------------------
Checking power cable between connector 24/4 and fuel tank pressure sensor
- Ignition off.
- Tank pressure sensor disconnected.
- Disassemble connector 24/4.
Connect an ohmmeter between connector 24/4 terminal E4 (engine control module (ECM) side) and ground.
The ohmmeter should read approximately 0.9 kohms.
OK -
Not OK -
------------------------
Checking for a short-circuit
- Check cable between fuel tank pressure sensor terminal 1 and connector E4 for an open-circuit according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Continue -
------------------------
Checking connector 24/2
- Ignition off.
- Tank pressure sensor disconnected.
- Connector 24/4 disassembled.
- Check connector 24/2 for contact resistance and oxidation and remedy according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
- Assemble connector 24/2.
Connect an ohmmeter between connector 24/4 terminal E4 (engine control module (ECM) side) and ground.
The ohmmeter should read approximately 0.9 kohms.
OK -
Not OK -
------------------------
Fault-tracing information
- The diagnostic trouble code (DTC) has been caused by loose connections in connector 24/2.
Continue -
------------------------
Checking power cable between connector 24/4 and 24/2
- Ignition off.
- Disassemble connector 24/2.
Connect an ohmmeter between connector 24/2 terminal C5 (engine control module (ECM) side) and ground.
The ohmmeter should read approximately 0.9 kohms.
OK -
Not OK -
------------------------
Checking for an open-circuit
- Check cable between connector 24/2 terminal C5 and connector 24/4 terminal E4 for an open-circuit according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Continue -
------------------------
Checking control module connector
- Ignition off.
- Tank pressure sensor disconnected.
- Connector 24/4 disassembled.
- Check control module connector for contact resistance and oxidation and remedy according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
- Connect control module.
Connect an ohmmeter between connector 24/2 terminal C5 (engine control module (ECM) side) and ground.
The ohmmeter should read approximately 0.9 kohms.
OK -
Not OK -
------------------------
Fault-tracing information
- The cause of the diagnostic trouble code (DTC) has been loose connections in the control module connector.
Continue -
------------------------
Checking for an open-circuit
- Check cable between connector 24/2 terminal C5 and engine control module (ECM) #B15 for an open-circuit according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Continue -
------------------------
Checking power cables
- Ignition off.
- Disassemble connector 24/4.
Connect an ohmmeter between connector 24/4 terminal E4 (engine control module (ECM) side) and ground.
The ohmmeter should read approximately 0.9 kohms.
OK -
Not OK -
------------------------
Checking for a short-circuit
- Check cable between connector 24/4 terminal E4 and fuel tank pressure sensor terminal 1 for a short-circuit to ground according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Continue -
------------------------
Checking cable between 24/2 and 24/4
- Ignition off.
- Disassemble connector 24/2.
Connect an ohmmeter between connector 24/2 terminal C5 (engine control module (ECM) side) and ground.
The ohmmeter should read approximately 0.9 kohms.
OK -
Not OK -
------------------------
Checking for a short-circuit
- Check cable between connector 24/2 terminal C5 and connector 24/4 terminal E4 for a short-circuit to ground according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Continue -
------------------------
Fault-tracing information
- The fuel tank pressure sensor power cable is connected inside the engine control module (ECM) to the accelerometer and A/C pressure sensor power cables. If anything happens to any of these cables all three will be affected. In cars without A/C the A/C pressure sensor wiring is pre-routed. Always check cables to these components.
- Check cables between:
Connector 24/2 terminal C5 and control module #B15.
Accelerometer terminal 1 and engine control module (ECM) #B1.
Air conditioning (A/C) pressure sensor terminal 3 and engine control module (ECM) #B29.
for a short-circuit to ground according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Continue -
------------------------
Checking the signal cable
- Ignition off.
- Tank pressure sensor disconnected.
- Ignition on.
Connect a voltmeter between tank pressure sensor connector terminal 3 (engine control module (ECM) side) and ground.
The voltmeter should read approximately 6 V.
OK -
Not OK -
------------------------
Checking signal cable resistance to ground
- Ignition off.
- Wait for approximately 150 seconds (cars with immobilizer 245 seconds).
- Tank pressure sensor disconnected.
Connect an ohmmeter between fuel tank pressure sensor connector terminal 3 (engine control module (ECM) side) and ground.
Does the ohmmeter read infinite resistance?
Yes -
No -
------------------------
Checking connector 24/4
- Ignition off.
- Tank pressure sensor disconnected.
- Check connector 24/4 for contact resistance and oxidation and remedy according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
- Assemble connector 24/4.
- Ignition on.
Connect a voltmeter between tank pressure sensor connector terminal 3 (engine control module (ECM) side) and ground.
The voltmeter should read approximately 6 V.
OK -
Not OK -
------------------------
Fault-tracing information
- The diagnostic trouble code (DTC) has been caused by loose connections in connector 24/4.
Continue -
------------------------
Checking signal cable between connector 24/4 and fuel tank pressure sensor
- Tank pressure sensor disconnected.
- Disassemble connector 24/4.
- Ignition on.
Connect a voltmeter between connector 24/4 terminal E5 (engine control module (ECM) side) and ground.
The voltmeter should read approximately 6 V.
OK -
Not OK -
------------------------
Checking for an open-circuit
- Check cable between fuel tank pressure sensor terminal 3 and connector 24/4 terminal E5 for an open-circuit according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Continue -
------------------------
Checking connector 24/2
- Ignition off.
- Tank pressure sensor disconnected.
- Connector 24/4 disassembled.
- Check connector 24/2 for contact resistance and oxidation and remedy according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
- Assemble connector 24/2.
- Ignition on.
Connect a voltmeter between connector 24/4 terminal E5 (engine control module (ECM) side) and ground.
The voltmeter should read approximately 6 V.
OK -
Not OK -
------------------------
Fault-tracing information
- The diagnostic trouble code (DTC) has been caused by loose connections in connector 24/2.
Continue -
------------------------
Checking signal cable between connector 24/4 and 24/2
- Disassemble connector 24/2.
- Ignition on.
Connect a voltmeter between connector 24/2 terminal C6 (engine control module (ECM) side) and ground.
The voltmeter should read approximately 6 V.
OK -
Not OK -
------------------------
Checking for an open-circuit
- Check cable between connector 24/2 terminal C6 and connector 24/4 terminal E5 for an open-circuit according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Continue -
------------------------