INTRODUCTION
Pin voltage charts are supplied (when available) to reduce diagnostic time. Checking pin voltages at the electronic control unit determines whether it is receiving and transmitting proper signals. Charts may also help determine if control unit harness is shorted or open.
Note. Unless stated otherwise in testing procedures, perform all voltage tests with a Digital Volt-Ohmmeter (DVOM) with a minimum 10-megohm input impedance.
PCM Pin Voltage Chart (1 Of 4) (7.4L "C" & "K" Series With M/T). Scheme 85
PCM Terminal A-B Connector ID - Red (1 Of 4) (7.4L "C" & "K" Series With M/T). Scheme 86
PCM Pin Voltage Chart (2 Of 4) (7.4L "C" & "K" Series With M/T). Scheme 87
PCM Terminal A-B Connector ID - Red (2 Of 4) (7.4L "C" & "K" Series With M/T). Scheme 88
PCM Pin Voltage Chart (3 Of 4) (7.4L "C" & "K" Series With M/T). Scheme 89
PCM Terminal E-F Connector ID - Blue (3 Of 4) (7.4L "C" & "K" Series With M/T). Scheme 90
PCM Pin Voltage Chart (4 Of 4) (7.4L "C" & "K" Series With M/T). Scheme 91
PCM Terminal E-F Connector ID - Blue (4 Of 4) (7.4L "C" & "K" Series With M/T). Scheme 92
7.4L "G" & "P" SERIES WITH A/T
Note. This PCM voltage chart, along with digital voltmeter, can help save diagnosis time. Voltage readings may vary slightly depending on battery voltage and alternator output.
The following conditions must be met before testing
- Engine at operating temperature.
- Engine in closed loop operation.
- Engine idling (Engine Operating column).
- DLC test terminal NOT grounded.
- Scan tester NOT installed.
