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Test G: Coast Clutch Solenoid: Testing

NOTE: If vehicle is equipped with Power Take-Off (PTO), ensure unit is turned off to perform this test.

  1. Electronic Diagnostics

    Ensure transmission harness connector is fully seated, terminals are fully engaged in connector and in good condition. Repair as necessary. Connect NGS tester to DLC. Perform KEY-ON-ENGINE-OFF (KOEO) SELF-TEST  until continuous memory code(s) have been displayed. See QUICK TEST  under DIAGNOSIS & TESTING. Select OUTPUT TEST MODE (OTM) on NGS tester. Select ALL ON MODE and press START. If vehicle enters OTM, go to next step. If vehicle will not enter OTM, see SCAN TOOL UNABLE TO COMMUNICATE  under DIAGNOSIS & TESTING.

  2. Check Electrical Signal Operation

    Disconnect transmission 12-pin harness connector. Inspect condition of connector. Repair as needed. Using DVOM, connect positive lead to transmission harness connector terminal No. 1 (Red/Yellow wire), and connect negative lead to terminal No. 5 (Brown/Orange wire). See Figure. While observing DVOM, press START then STOP on NGS tester to cycle solenoid output. If voltage changes to about battery voltage, go to step  5. If voltage does not change, go to next step.

  3. Check Continuity Of CCS Signal & VPWR Circuits

    Turn ignition switch to OFF position. Disconnect PCM 104-pin harness connector, and inspect it for damaged terminals, corrosion and loose wires. Repair as necessary. Install breakout box, leaving PCM disconnected. On Federal models equipped with 7.3L diesel engines, measure and record resistance between breakout box pin No. 53 and transmission harness connector terminal No. 5 (Brown/Orange wire). On California models equipped with 7.3L diesel engine and all gasoline engines, measure and record resistance between breakout box pin No. 20 and transmission harness connector terminal No. 5 (Brown/Orange wire). On all models, measure and record resistance between breakout box pins No. 71 and 97 and transmission harness connector terminal No. 1 (Red/Yellow wire). See Figure. If each resistance is less than 5 ohms, go to next step. If any resistance is 5 ohms or more, repair open circuit(s). Disconnect breakout box. Reconnect all components. Erase all DTCs. See CLEARING DIAGNOSTIC TROUBLE CODES  under DIAGNOSIS & TESTING. Repeat QUICK TEST .

  4. Check CCS Circuit For Shorts To Power Or Ground

    On Federal models equipped with 7.3L diesel engines, measure and record resistance between breakout box pin No. 53 and breakout box pins No. 71 and 97. On California models equipped with 7.3L diesel engine and all gasoline engines, measure and record resistance between breakout box pin No. 20 and breakout box pins No. 71 and 97. On Federal models equipped with 7.3L diesel engines, measure and record resistance between breakout box pin No. 50 and breakout box pins No. 24, 51, 76, 77, 91, 103, and ground. On California models equipped with 7.3L diesel engines and all gasoline engines, measure and record resistance between breakout box pin No. 20 and breakout box pins No. 24, 51, 76, 77, 91, 103, and ground. See Figure. If each resistance is more than 10 k/ohms, go to next step. If any resistance is 10 k/ohms or less, repair short circuit(s). Disconnect breakout box. Reconnect all connectors. Repeat QUICK TEST  under DIAGNOSIS & TESTING.

  5. CCS Functional Test

    Ensure ignition switch is turned to OFF position. Reconnect PCM 104-pin harness connector. Disconnect transmission 12-pin harness connector. Connect transmission tester to transmission 12-pin harness connector. Perform CCS voltage test. See tester instructions. If CCS activates (LED Green), go to next step. If solenoid does not operate, LED does not light (solenoid shorted to ground or open circuit), or indicates short to battery voltage (LED Red), go to step  7.

  6. Transmission Drive Test

    Perform DYNAMIC TESTING - ENGINE ON test. See tester instructions. If CCS activates (LED Green) and engine braking occurs, replace PCM and erase all DTCs. See CLEARING DIAGNOSTIC TROUBLE CODES  under DIAGNOSIS & TESTING. Perform TRANSMISSION DRIVE CYCLE TEST  under DIAGNOSIS & TESTING. Repeat QUICK TEST . If condition is still present, diagnose problem by symptom. See SYMPTOM DIAGNOSIS  under TROUBLE SHOOTING. If CCS does not activate (no engine braking), go to next step.

  7. Check Resistance Of Solenoid

    Ensure tester power is off. Set Bench/Drive switch to BENCH MODE. Set Gear Select switch on transmission tester to OHMS CHECK position. Connect ohmmeter to both CCS terminals on tester. If resistance is 20-30 ohms, go to next step. If resistance is not 20-30 ohms, replace solenoid body assembly. Connect all components. Erase all DTCs. See CLEARING DIAGNOSTIC TROUBLE CODES  under DIAGNOSIS & TESTING. Repeat QUICK TEST .

  8. Check Solenoid For Short To Ground

    Check continuity between transmission tester BAT (-) terminal and both CCS terminals on transmission tester. If continuity exists, replace solenoid body assembly. Connect all components. Erase all DTCs. See CLEARING DIAGNOSTIC TROUBLE CODES  under DIAGNOSIS & TESTING. Repeat QUICK TEST . If continuity does not exist, diagnose problem by symptom. See SYMPTOM DIAGNOSIS  under TROUBLE SHOOTING.
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