DD15 Troubleshooting – Section 31.2 SPN 164/FMI 1

Section 31.2
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:‪

1. Disconnect the Quantity Control Valve harness connector.
2. Ensure the multi meter (DVOM) resistance is zero.
   1. If meter can auto zero, perform this function before making a resistance measurement
   2. If meter can not auto zero, note the resistance of the leads and subtract it from the measurement taken in step 3
3. Measure the resistance across pins 1 and 2 of the Quantity Control Valve.
   1. If the resistance is less than 1.3 Ω, replace Quantity Control Valve. Refer to "31.2.1 Verify Repairs" .
   2. If the resistance is between 1.3 Ω and 1.4 Ω, go to the next step.
4. 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
5. Turn ignition ON.
6. Measure the voltage at pin 2 of the Quantity Control Valve harness connector.
   1. If the voltage is 0, replace the MCM. Refer to "31.2.1 Verify Repairs" .
   2. If the voltage is greater than 0, repair the short circuit between pin 2 of the Quantity Control Valve harness connector and battery. Refer to "31.2.1 Verify Repairs" .

Section 31.2.1
Verify Repairs

Verify repairs as follows:‪

1. Turn ignition OFF.
2. Reconnect any electrical connections that were disconnected to perform the diagnosis.
3. Clear codes with DDDL 7.0 or latest version.

   ENGINE EXHAUST ‪
   To avoid injury from inhaling engine exhaust, always operate the engine in a well-ventilated area. Engine exhaust is toxic.‪

4. Start and bring engine up to operating temperature (over 140°F/60°C).
5. Verify operation is satisfactory and no warning lamps illuminate. If warning lamps illuminate, troubleshoot the codes. If assistance is required, call the Detroit Diesel Customer Support Center at 313–592–5800.