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8-52
1977 PONTIAC SERVICE MANUAL
DIAGNOSIS
Speedometer
CONDITION
CORRECTION
Noisy speedometer cable.
Pointer and odometer inoperative.
Inaccurate reading.
Kinked cable.
Defective speedometer head.
Casing connector loose on speedometer case.
Remove cable and shorten if necessary.
Insure that housing is routed properly.
Replace housing if kinked.
Replace broken cable.
Check tire size.
Check for correct speedometer driven gear.
Replace cable. Re-route casing so that bends have
no less than 6" radius (unless pre-formed).
Replace or have repaired at authorized service
station.
Tighten connector.
Oil Pressure Indicator
CAUSE
CORRECTION
Oil light stays on with engine running
Check sender unit for improper ground.
(if electrical failure).
Check connection at bulkhead connector.
Check for short from printed circuit to bulkhead.
Check for ground between switch and bulkhead
connector.
Check erigine oil pressure.
Check bulb.
Check for blown fuse.
Check for open in above circuits.
Check for open at printed circuit connector.
Check break in printed circuit.
Lamp does not come on during crank.
Temperature Warning Lamp
CONDITION
CORRECTION
Temperature warning lamp stays on (if
Check sender for abnormal ground.
electrical failure).
Check for short between bulkhead and sender.
Check for short from bulkhead to printed circuit.
Check printed circuit.
Temperature warning lamp inoperative during crank
Check bulb.
Check fuse.
Check for open in circuit.
GENERATOR INDICATOR LAMP
See Engine Electrical Section, 6D.
LOW COOLANT LEVEL INDICATOR
INDICATOR LAMP WILL NOT ILLUMINATE
1. Turn ignition switch to CRANK position. If lamp
illuminates, system is OK
.
If lamp still does not illuminate,
go to step 2.
2. Turn ignition switch to ON position and disconnect
electrical lead at coolant level sensor on radiator. If lamp
illuminates, replace sensor. If lamp fails to illuminate,
connect electrical lead and go to step 3.
3. Check indicator lamp. If lamp is defective, replace.
If lamp is OK
,
go to step 4.
4. Check for an open circuit between sensor and module,
then from module to indicator. If an open circuit is found,
repair. If no open circuit is found, replace module.
INDICATOR LAMP REAMINS ON AT ALL
TIMES
1. Turn ignition switch to ON position and check
coolant level. Add coolant if necessary. If indicator lamp
remains illuminated, go to step 2.
2. Disconnect electrical lead at coolant level sensor on
radiator. Use a jumper wire and ground electrical connector.
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