34.1 SPN 174/FMI 3 SPN 174/FMI 3 indicates a SFT Sensor open circuit or short to power. 34.1.1 Open Circuit/Short to Power Check Check as…

32.1 SPN 168/FMI 0 This diagnosis is typically battery voltage high. 32.1.1 Measure Battery Voltage Check as follows: 1. Measure battery voltage with the engine…

31.1 SPN 132/FMI1 This code typically means the air mass flow is too low. 31.1.1 Low Air Mass Flow Check Check as follows: 1. Check…

This fault is typically a circuit failed low. 30.3.1 Short to Ground Check Check for a short to ground as follows: 1. Turn the ignition…

This condition is typically a circuit failed high. 30.2.1 Open Circuit Check Check as follows: 1. Check for multiple codes. [a] If other faults are…

This diagnosis typically coolant level low. 30.1.1 Engine Coolant Level Sensor Check Check as follows: 1. Turn the vehicle ignition switch ON (key On, engine…

The diagnostic condition is typically engine coolant temperature very high. 29.5.1 Multiple Codes Check Check as follows: 1. Turn vehicle ignition switch ON (key ON,…

The diagnostic condition is typically engine coolant temperature circuit failed low. 29.3.1 Short to Ground Check Check as follows: 1. Disconnect the ECT Sensor. 2.…

SPN 110/FMI 3 indicates that the Engine Coolant Temperature Sensor (ECT Sensor) input to the MCM has exceeded 95% of the sensor supply voltage. The…

The diagnostic condition is typically engine coolant temperature high. 29.1.1 System Checks to Resolve Fault Check as follows: 1. Check for multiple codes. [a] If…