SPN 164/FMI 1
SPN 164/FMI 1 indicates a Quantity Control Valve Low Side driver error. This condition can occur when:
- MCM pin 2 circuit is shorted to power
- Internal short of the Quantity Control Valve
Check as follows:
- Disconnect the Quantity Control Valve harness connector.
- Ensure the multi meter (DVOM) resistance is zero.
- If meter can auto zero, perform this function before making a resistance measurement
- If meter can not auto zero, note the resistance of the leads and subtract it from the measurement taken in step 3
- Measure the resistance across pins 1 and 2 of the Quantity Control Valve.
- If the resistance is less than 1.3 Ω, replace Quantity Control Valve. Refer to “31.2.1 Verify Repairs” .
- If the resistance is between 1.3 Ω and 1.4 Ω, go to the next step.
- Disconnect the 120-pin MCM connector and check for corroded, bent or broken pins. Ensure both the MCM and harness connector pins are checked. Repair or replace if needed
- Turn ignition ON.
- Measure the voltage at pin 2 of the Quantity Control Valve harness connector.
- If the voltage is 0, replace the MCM. Refer to “31.2.1 Verify Repairs” .
- If the voltage is greater than 0, repair the short circuit between pin 2 of the Quantity Control Valve harness connector and battery.