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Detroit Fault Codes SPN 97/FMI 3 – EPA07 – EPA10 – GHG14

12/04/2026
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SPN 97/FMI 3 - EPA07 - EPA10 - GHG14
Water-in-Fuel Circuit Failed High
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 3

Check as follows:

1. Check for multiple codes.
1.1. If EGR fault SPN 2791 FMI 3 is also active:
Three-filter fuel systems: repair the open circuit from pin 67 of the MCM 120-pin connector to pin 3 of the WIF sensor harness connector and Pin 2 of the EGR actuator harness connector.
Two-filter fuel systems: repair the open circuit from pin 67 of the MCM 120-pin connector to pin 4 of the WIF sensor harness connector and Pin 2 of the Exhaust Gas Recirculation (EGR) actuator harness connector.
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 harness connector.
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 connector shows no signs of damage, Go to step 5.
5. Turn the ignition ON (key ON, engine OFF).
6. Check for power and ground at the WIF sensor harness connector.
Three-filter fuel systems: measure the voltage between pins 1 and 3 of the WIF sensor harness connector.
Two-filter fuel systems: measure the voltage between pins 1 and 4 of the WIF sensor harness connector.
6.1. If the voltage is greater than 11.5 volts, Go to step 7.
6.2. If the voltage is less than 11.5 volts, Go to step 8.
7. Check the sensor signal wire on the WIF sensor harness connector.
Three-filter fuel systems: measure the voltage between pins 2 and 3 of the WIF sensor harness connector.
Two-filter fuel systems: measure the voltage between pins 2 and 4 of the WIF sensor harness connector.
7.1. If the voltage is between 4.5 and 5.5 volts, replace the WIF sensor referring to the proper procedure for the engine being serviced.
Refer to section “Removal of the Water-in-Fuel Sensor – Two-Filter Fuel System” .
Refer to section “Removal of the Water-in-Fuel Sensor – Three-Filter Fuel System” .
7.2. If the voltage is less than 4.5 volts, repair the wire between pin 2 of the harness side of the WIF sensor and pin 57 of the MCM 120-pin connector. Verify repairs.
7.3. If the voltage is greater than 5.5 volts, Go to step 9.
8. Determine if the WIF sensor power or ground wire has failed. Measure the voltage between pin 1 of the WIF sensor harness connector and engine ground (Battery Ground).
8.1. If the voltage is greater than 11.5 volts,
Three-Filter Fuel systems: repair the wire between pin 3 of the WIF sensor harness connector and pin 67 of the MCM 120-pin connector. Verify repairs.
Two-Filter Fuel systems: repair the wire between pin 4 of the WIF sensor harness connector and pin 67 of the MCM 120-pin connector. Verify repairs.
8.2. If the voltage is less than 11.5 volts,
Three-filter fuel systems: repair the wire between pin 1 of the WIF sensor harness connector and pin 71 of the MCM 120-pin connector.
Two-filter fuel systems:
KM63 GEN2 two-filter fuel systems: repair the wire between pin 1 of the WIF sensor harness connector and pin 71 of the MCM 120-pin connector (Either Fuel Filter system). Verify repairs.
KM59 GEN1 two-filter fuel systems: repair the wire between pin 1 of the WIF sensor harness connector and pin 62 of the MCM 120-pin connector (Either Fuel Filter system). Verify repairs.
9. Turn the ignition OFF.
10. Disconnect the MCM 120-pin connector.
11. Inspect the MCM 120-pin connector and harness connector for signs of damage, water intrusion, bent, spread, corroded or pushed out (unseated) pins.
11.1. If signs of damage are present, repair as necessary.
11.2. If no signs of damage are present, Go to step 12.
12. Perform a continuity test between the following pins on the MCM 120-pin harness connector and pins on the WIF sensor harness connector.
12.1. Signal circuit wire; 120-pin connector pin 57 and WIF harness connector pin 2.
12.2. Ground circuit wire:
Three-filter fuel system: 120-pin connector pin 67 and WIF harness connector pin 3.
Two-filter fuel system: 120-pin connector pin 67 and WIF harness connector pin 4.
12.3. Power circuit wire;
Three-filter fuel systems: 120-pin connector pin 71 and WIF harness connector pin 1. Verify repairs.
KM63 GEN2 two-filter fuel systems: 120-pin connector pin 71 and WIF harness connector pin 1. Verify repairs.
KM59 GEN1 two-filter fuel systems: 120-pin connector pin 62 and WIF harness connector pin 1.
If a resistance value greater than 5 ohms is found for any of the above tests, repair the wire for the pin pairs tested. Verify repairs.
13. 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.

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