TP-5737 5/0138 Section 5 Decision-Makert 3+ Troubleshooting
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1
2
1. P4-6 (+) connection
2. P4-1 (--) connection
Figure 5 -24 Checking Input to Lamp Circuit Board
Is there an open speed sensor circuit? Check the
continuity of wire 2 (black), wire 16 (white), and wire 24
(red) between the P1 connector and the speed sensor.
Check for 8-10 volts DC across the speed sensor (+)
positive terminal and (--) negative terminal. Check wire
16 for 3-6 volts DC, and wire 24 for 8-10 volts DC. Does
this test check out okay?
Is the speed sensor air gap greater
than that specified in Section 1?
Engine starts and runs, but overcrank lamp flashes.
Note: The overcrank lamp flashes if the speed
sensor signal is absent longer than one second.
Adjust the speed sensor air gap to
0.014-0.028 in. (0.36-0.71 mm). See
Figure 5-26.
Inoperative speed sensor.
See Section 7.10, Speed
Sensor Test.
Repair the circuit.
No
Yes
Yes
No
Figure 5 -25 Overcrank Lamp
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