Labels:text | screenshot | font | document | black and white | number | parallel OCR: DIAGNOSIS OF THE COOLANT TEMPERATURE GAGE (cont'd) PROBLEM POSSIBLE CAUSE CORRECTION Gage Reads Low 1. Resistance in the circuit due to corro- 1. Clean and tighten the terminals and sion or a loose connection. connections in the circuit. Check for resistance in the ground path of the sensor. 2. Sensor. 2. Remove the lead at the sensor. Mea- sure the resistance with an ohmmeter. At 40 /C (104 /F) the resistance is 1365 ohms. At 125 /C (257 /F) the resistance is 55.1 ohms. If the sensor does not have approximately these val- ues, replace the sensor, Gage Reads High 1. Sensor. 1. Measure the sensor's resistance as 2. Circuit has a high resistance ground. described in the previous step. 2. Disconnect the sensor lead at the gage and sensor. Check for a high resistance ground with an ohmmeter. Repair the circuit. DIAGNOSIS OF THE OIL PRESSURE GAGE PROBLEM POSSIBLE CAUSE CORRECTION Gage Reads at "0" 1. Low oil level. 1. Check oil level. Add oil if necessary. 2. The circuit is grounded between the 2. Remove the sensor lead at the sensor. gage and the sensor. The gage should read "80." If the gage stays at "0", remove the sensor lead at the gage. The gage should read "80. " If the gage reads "80", find the ground in the circuit between the gage and the sensor. If the gage 3. Sensor. reads "0", replace the gage. 3. Remove the sensor lead at the sensor. Connect an ohmmeter to the sensor. With the engine stopped, the resis- tance should be one ohm. With the engine running, the resistance should be about 44 ohms at 40 psi (275 kPa). If the sensor reads one ohm with the engine running, replace the sensor. Gage Reads "80" The sensor circuit has an open. Disconnect the sensor lead from the sen- PSI or Above sor. Ground the sensor lead. The gage should read "0" psi. If the gage reads "0" psi, replace the sensor. If the gage stays at "80" psi, find the open in the circuit between the gage and the sensor. Gage Readings are Gage Remove the sensor lead from the sensor. In Error Connect the J 24538.A Tester to the sensor lead and ground. If the gage responds accurately to the tester, replace the sensor. If the gage does not respond accurately to the tester, replace the gage.
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