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Gauge Assembly
Coolant Temperature Gauge Test
Coolant temperature gauge nee-
dle does not move at all.
1. Turn the ignition switch OFF.
2. Connect ECM connector ter-
minal A18 to body ground
with a jumper wire.
3. Turn the ignition switch ON
(II).
Within two to five seconds,
does the temperature gauge
needle move to the Hot side?
1. Turn the ignition switch OFF.
2. Disconnect ECM connector A
(26P).
3. Turn the ignition switch ON
(II).
4. Measure voltage between
ECM connector terminal A18
and body ground.
Is there approx. 5 V?
1. Turn the ignition switch OFF.
2. Check for continuity between
ECM connector terminal A18
and gauge assembly connec-
tor terminal A12.
Is there continuity?
Repair open in the wire between
ECM connector terminal A18 and
gauge assembly connector ter-
minal A12.
Table of Contents
Substitute a known good ECM
and recheck. If the symptom/
indication goes away, replace
the original ECM.
Replace the coolant temperature
gauge.
Replace the coolant temperature
gauge.
ECM CONNECTOR A (26P)
Wire side of female terminals
GAUGE ASSEMBLY CONNECTOR A (30P)
Wire side of female terminals
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