Section 04 FUEL SYSTEM
Subsection 02 (ELECTRONIC FUEL INJECTION (EFI))
COOLANT TEMPERATURE
SENSOR (CTS)
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TYPICAL
1. Coolant temperature sensor (CTS)
NOTE: Overheat signals will appear when coolant
temperature reaches:
ENGINE TEMPERATURE
All 1503
110°C (230°F)
CTS Resistance Test
To gain access to the CTS, remove the required
parts as described in
CTS REPLACEMENT.
Disconnect the connector from the CTS and check
the resistance of the sensor itself.
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The resistance should be as per following chart.
Otherwise, replace the CTS.
If resistance tests good, reconnect the CTS con-
nector and disconnect the ECM connector A on
the ECM.
Using a multimeter and the
ECM ADAPTER TOOL
(P/N 529 036 166)
, check the circuit resistance as
per table.
ECM ADAPTER MEASUREMENT
PIN RESISTANCE
A-A1 A-J2
See table below
TEMPERATURE RESISTANCE (OHMS)
°C °F NOMINAL LOW HIGH
- 30 - 22 12600 11800 13400
-20
-4
11400 11000 11800
-10
14
9500 8000 11,000
0 32 5900 4900 6900
10 50 3800 3100 4500
20 68 2500 2200 2800
30 86 1700 1500 1900
40 104 1200 1080 1320
50 122 840 750 930
60 140 630 510 750
70 158 440 370 510
80 176 325 280 370
90 194 245 210 280
100 212 195 160 210
110 230
145
125 160
120 248
115
100 125
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If resistance value is correct, check ECM. Refer to
ECM
elsewhere in this section.
If resistance value is incorrect, repair the connec-
tors or replace the wiring harness between ECM
connector and the CTS.
CTS Replacement
Open seat.
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