MODEL IDENTIFICATION
| Model | (1) Series Designation |
|---|---|
| 2WD Models | "C" |
| 4WD Models | "K" |
| (1) Series codes determined by fifth character of VIN code | |
| (1) | Series codes determined by fifth character of VIN code |
BODY CODE DESIGNATIONS
DESCRIPTION & OPERATION
Note. All "C" & "K" trucks use Engine Control Module (ECM), Powertrain Control Module (PCM) or Vehicle Control Module (VCM) to maintain engine idle speed during A/C compressor clutch operation. These trucks do not use ECM, PCM or VCM to control A/C compressor clutch circuit.
On vehicles without a PCM-controlled A/C compressor clutch, turning on A/C system supplies battery voltage to the A/C compressor clutch and A/C request signal terminal of Engine Control Module (ECM), Powertrain Control Module (PCM) or Vehicle Control Module (VCM). When the ECM, PCM or VCM sees battery voltage at A/C request signal terminal, it maintains idle speed. The ECM, PCM or VCM does not control A/C compressor clutch operation. An A/C pressure cycling switch is used to control A/C compressor clutch operation.