Pinout Values and Diagnostic Parameters

Fig. 4 Engine Controller & Connector Location:

Fig. 5 Engine Controller 60-Way Connector, Shown From Terminal End:

1. Disconnect 60-way connector from engine controller.
2. Connect negative lead of voltmeter to ground near controller, then turn ignition switch to the On position.
3. Place positive lead of voltmeter to cavity of terminal 53. With the speed control switch in the Off position, voltmeter should indicate zero volts.
4. With speed control switch in the On position, voltmeter should indicate battery voltage. If not, repair main harness as necessary.
5. Place positive lead of voltmeter to cavity of terminal 33. With the speed control switch in the Off position, voltmeter should indicate zero volts.
6. With speed control switch in the On position, voltmeter should indicate battery voltage.
7. If no voltage is present, repair wire between terminal 33 and terminal 4 of speed control servo.
8. Place positive lead of voltmeter to cavity of terminal 48. With the speed control switch in the Off position, voltmeter should indicate zero volts.
9. With speed control switch in the On position, voltmeter should indicate battery voltage.
10. Press the Set button. This should cause the voltmeter to switch from indicating battery voltage to zero volts for as long as the switch is held. If not, perform "Speed Control Switch Test." If the switch is satisfactory, repair wire between pin 48 and speed control switch.
11. Place positive lead of voltmeter to cavity of terminal 50. With the speed control switch in the On or Off position, voltmeter should indicate zero volts.
12. With switch in the On position, press Resume button. Battery voltage should be read as long as button is held. If not, perform "Speed Control Switch Test."
13. If switch is satisfactory, repair wire between pin 50 and speed control switch.
14. Place positive lead of voltmeter to cavity of terminal 49. With switch in the Off position, voltmeter should indicate zero volts.
15. With switch in the On position, voltmeter should indicate battery voltage.
16. If voltage is not indicated, repair wire between terminal 49 and speed control switch.
17. Using an ohmmeter, connect one lead to body ground, then the cavity of terminal 29.
18. With the brake pedal released, the meter should indicate continuity. When pedal is depressed, the meter should indicate an open circuit.
19. Touch one lead of ohmmeter to a good body ground and the other lead to terminal 30.
20. With transmission in D, meter should show NO continuity. When in P or N, meter should show continuity.
21. If above results are not measured, test neutral start and back-up switch using DRB II readout tool.