GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 1997 🢒 GMC P42 Commercial Chassis 🢒 Body and Accessories 🢒 Instrument Panel, Gauges, and Console 🢒 Engine Coolant Temperature Gauge Appears Inaccurate

Engine Coolant Temperature Gauge Appears Inaccurate P92

P92 Engine Coolant Temperature Gauge Appears Inaccurate

Step

Action

Value(s)

Yes

No

1

Does the temperature gauge read accurately?

--

System OK

Go to Step 2

2

Does the temperature gauge indicate cold at all times?

--

Go to Step 8

Go to Step 3

3

Does the temperature gauge indicate hot when the engine coolant is below operating temperature with the ignition is in RUN?

--

Go to Step 9

Go to Step 4

4
  1. Disconnect the engine coolant temperature sender connector.
  2. Connect the red lead of J 39200 to the WHT (17) wire and the other lead to the ground.
  3. Adjust the resistance dials.

    4. Does the temperature gauge indicate the specified values?

1400 ohms (cold)

55 ohms (hot)

Go to Step 5

Go to Step 6

5

Replace the engine coolant temperature sender.

Is the repair complete?

--

Go to Step 1

--

6

Locate an open in the WHT (17) wire between the engine coolant temperature sender connector and the temperature gauge.

Is the WHT (17) wire open?

--

Go to Step 11

Go to Step 7

7

Replace the temperature gauge.

Is the repair complete?

--

Go to Step 1

--

8
  1. Disconnect the engine coolant temperature sender connector.
  2. Ground the WHT (17) wire at the engine coolant temperature sender connector.

Does the temperature gauge read hot?

--

Go to Step 5

Go to Step 6

9
  1. Disconnect the engine coolant temperature sender connector.
  2. Place the ignition switch in RUN.

Does the temperature gauge indicate cold?

--

Go to Step 5

Go to Step 10

10

Locate an open in the WHT (17) wire between the engine coolant temperature sender connector and temperature gauge.

Is the WHT (17) wire open?

--

Go to Step 11

Go to Step 4

11

Repair or replace the wire.

Is the repair complete?

--

Go to Step 1

--

Engine Coolant Temperature Gauge Appears Inaccurate P72

P72 Engine Coolant Temperature Gauge Appears Inaccurate

Step

Action

Value(s)

Yes

No

1

Does the temperature gauge read accurately?

--

System OK

Go to Step 2

2

Does the temperature gauge indicate cold at all times?

--

Go to Step 8

Go to Step 3

3

Does the temperature gauge indicate hot when the engine coolant is below operating temperature with the ignition is in RUN?

--

Go to Step 9

Go to Step 4

4
  1. Disconnect the engine coolant temperature sender connector.
  2. Connect the Red lead of J 39200
  3. Adjust the resistance dials.

    4. Does the temperature gauge indicate the specified values?

1400 ohms (cold)

55 ohms (hot)

Go to Step 5

Go to Step 6

5

Replace the engine coolant temperature sender.

Is the repair complete?

--

Go to Step 1

--

6

Locate an open in the DK GRN (35) wire between the engine coolant temperature sender connector and the temperature gauge.

Is the DK GRN (35) wire open?

--

Go to Step 11

Go to Step 7

7

Replace the temperature gauge.

Is the repair complete?

--

Go to Step 1

--

8
  1. Disconnect the engine coolant temperature sender connector.
  2. Ground the DK GRN (35) wire at the engine coolant temperature sender connector.

Does the temperature gauge read hot?

--

Go to Step 5

Go to Step 6

9
  1. Disconnect the engine coolant temperature sender connector.
  2. Place the ignition switch in RUN.

Does the temperature gauge indicate cold?

--

Go to Step 5

Go to Step 10

10

Locate an open in the DK GRN (35) wire between the engine coolant temperature sender connector and the temperature gauge.

Is the DK GRN (35) wire open?

--

Go to Step 11

Go to Step 4

11

Repair or replace the wire.

Is the repair complete?

--

Go to Step 1

--