Trang chủ › Trouble Codes › Detroit › Detroit Fault Codes SPN 97/FMI 4 – EPA07 – EPA10 – GHG14

Detroit Fault Codes SPN 97/FMI 4 – EPA07 – EPA10 – GHG14

13/04/2026
Facebook WhatsApp
SPN 97/FMI 4 - EPA07 - EPA10 - GHG14
Water-in-Fuel Circuit Failed Low
Water-in-Fuel (WIF) sensor circuitry differs for engines equipped with three-filter fuel systems and those equipped with two-filter fuel systems. There are also slight differences between two-filter fuel systems, KM63 GEN2 is the GHG14 variant and KM59 GEN1 is the EPA10 variant. Differences are noted as required.
SPN 97/FMI 4

Check as follows:

1. Check for multiple codes.
1.1. If SPN 168 FMI 1 (battery voltage low) is also active troubleshoot that fault first.
1.2. If only fault SPN 97/FMI 4 is active, Go to step 2.
2. Turn the ignition OFF.
3. Disconnect the WIF sensor.
4. Inspect the sensor harness connector for signs of damage, water intrusion, bent, spread, corroded, pushed out (unseated) pins or frayed wiring.
4.1. If signs of damage are present, repair as necessary.
4.2. If no signs of damage are present, Go to step 5.
5. Disconnect the Motor Control Module (MCM) 120-pin connector.
6. Inspect the MCM 120-pin connector and harness connector for signs of damage, water intrusion, bent, spread, corroded, pushed out (unseated) pins or frayed wiring.
6.1. If signs of damage are present, repair as necessary.
6.2. If connector shows no signs of damage, Go to step 7.
7. Check for shorted power wire: Measure the resistance between pin 1 of the WIF sensor connector and engine ground (battery ground).
7.1. If resistance is less than 10K ohms, repair the short to ground in the wire between pin 1 of the WIF sensor and pin 71 of the MCM 120-pin connector.
7.2. If resistance is greater than 10K ohms, Go to step 8.
8. Check for shorted signal wire: Measure the resistance between pin 2 of the WIF sensor harness connector and ground.
8.1. If resistance is less than 10K ohms, repair the short ground in the wire between pin 2 of the WIF sensor and pin 57 of the MCM 120-pin connector.
8.2. If resistance is greater than 10K ohms, Go to step 9.
9. Check for shorted ground wire:
Three-filter fuel systems: Measure the resistance between pin 3 of the WIF sensor harness connector and ground.
Two-filter fuel systems: Measure the resistance between pin 4 of the WIF sensor harness connector and ground.
9.1. If resistance is less than 10K ohms, repair the short circuit between the ground wire of the WIF sensor harness and battery ground (unintended ground).
9.2. If resistance is greater than 10K ohms, Go to step 10.
10. Check for a short between the power and ground wires:
Three-filter fuel systems: measure the resistance between pins 1 and 3 of the WIF sensor harness connector.
Two-filter fuel systems: measure the resistance between pins 1 and 4 of the WIF sensor harness connector.
10.1. If resistance is less than 10K ohms, repair the short circuit between the power and ground wires of the WIF sensor harness.
10.2. If resistance is greater than 10K ohms, Go to step 11.
11. Check for short between the signal and ground wires:
Three-filter fuel systems: measure the resistance between pins 2 and 3 of the WIF sensor harness connector.
Two-filter fuel systems: measure the resistance between pins 2 and 4 of the WIF sensor harness connector.
11.1. If resistance is less than 10K ohms, repair the short circuit between the signal and ground wires of the WIF sensor harness.
11.2. If resistance is greater than 10K ohms, Go to step 12.
12. Reconnect the MCM 120 way harness connector.
13. Turn the ignition ON (Key ON, Engine OFF).
14. Check the power to the WIF sensor:
Three-filter fuel systems: Measure the voltage between pins 1 and 3 of the WIF harness connector.
Two-filter fuel systems: Measure the voltage between pins 1 and 4 of the WIF harness connector.
14.1. If the voltage is less than 11.5 volts, Go to step 17.
14.2. If the voltage is greater than 11.5 volts, Go to step 15.
15. Using DiagnosticLink® , monitor fault code SPN 97/FMI 4.
16. Reconnect the WIF harness connector to the sensor and wait 30 seconds.
16.1. If SPN 97/FMI 4 becomes inactive, clear codes and release vehicle.
16.2. If SPN 97/FMI 4 remains active, replace the WIF sensor, Go to step 17.
17. If a problem still exists, review the previous steps of this diagnostic procedure. If the results are the same, contact Detroit Customer Support Center at 800-445-1980.

AutoZone Tech

preloader