Instruments - Troubleshooting Outside Temperature Gauge
03-082December 19, 2003
Applies To:
2003-04 Accord DX, LX, and L4 EX Without Climate Control - ALL
Outside Air Temperature Gauge Accessory Troubleshooting Guide
(P/N 08E71-SDA-100)
(Supersedes 03-082, dated November 16, 2003)
Updated information is shown with black bars and asterisks.
This bulletin includes the system specifications, troubleshooting guides, and a circuit diagram for the accessory outside temperature gauge, P/N 08E71-SDA-100.
SPECIFICATIONS
OUTSIDE AIR TEMPERATURE GAUGE SYSTEM DESCRIPTION
Body Controller Area Network (B-CAN)
*The outside air temperature sensor changes resistance with changes in ambient air temperature. The outside air temperature control unit converts the resistance value of the outside air temperature sensor into a digital signal and sends it over the B-CAN line. The gauge control module receives the signal, and displays it as the outside air temperature.
Outside Air Temperature Indicator Logic
If the engine coolant temperature is 140°F (60°C) or higher when the ignition switch is turned on, the last outside temperature indicated will be displayed. If the engine coolant temperature is 139°F (59°C) or below when the ignition switch is turned on, the current outside temperature will be displayed. This logic has been written into the gauge control module to help prevent abnormal or fluctuating outside temperature indicator readings due to heat reflection from the road, the engine, and surrounding traffic.*
Outside Air Temperature Gauge System Diagram
HDS INPUT AND OUTPUT COMMANDS
TROUBLESHOOTING GUIDE
Outside Air Temperature Is Not Shown on the Display
* NOTE:
Before troubleshooting the outside air temperature circuit, check for B-CAN DTCs. If any DTCs are present, perform B-CAN system diagnosis test mode A.
1. Check the No. 33 (3A) and No. 30 (7.5A) fuses in the under-dash fuse/relay box.
Are the fuses OK? YES - Go to step 2.
NO - Replace the fuses, and check the temperature display.[]*
2. Check the BATT (2A) fuse on the accessory wire harness.
Is the fuse OK?
YES - Go to step 3.
NO - Replace the fuse, and check the temperature display.[]
3. * Check the IG2 (2A) fuse on the accessory wire harness.
Is the fuse OK?
YES - Go to step 4.
NO - Replace the fuse, and check the temperature display.[]
4. Disconnect the outside air temperature gauge control unit connector (22P).
5. Check for resistance between terminal No. 17 (BLU) and terminal No. 18 (GRN) of the outside air temperature gauge control unit connector (22P).
Is there about 500 to 20 K Ohms?
YES - Go to step 7.
NO - Go to step 6.
6. Check the resistance of the outside air temperature sensor.
Is there about 500 to 20 k Ohms?
YES - Repair the open in the BLU or GRN wire.[]
NO - Replace the outside air temperature sensor.[]
7. Check for continuity between terminal No. 11 (BLK) of the outside air temperature gauge control unit connector (22P) and body ground.
Is there continuity?
YES - Go to step 8.
NO - Repair the open in the BLK wire between the outside air temperature gauge control unit connector (22P) terminal No. 11 and body ground.
8. Check for continuity between terminal No. 16 (BLK) of the outside air temperature gauge control unit connector (22P) and body ground.
Is there continuity?
YES - Go to step 9.
NO - Repair the open in the BLK wire between the outside air temperature gauge control unit connector (22P) terminal No. 16 and body ground.
9. Check for continuity between the under-dash fusel relay box connector T (6P) terminal No. 3 and the outside air temperature control unit (22P) terminal No. 7.
Is there continuity?
YES - Go to step 10.
NO - Repair the open in the BRN/RED wire between terminal No. 3 of the under-dash fusel relay box connector T (6P) and terminal No. 7 of the outside temperature sensor connector (22P).[]
10. Measure the voltage between terminal No. 1 (WHT/ BLU) and terminal No. 11 (BLK) of the outside air temperature gauge control unit connector (22P).
Is there battery voltage?
YES - Go to step 11.
NO - Repair the open in the WHT wire between the No. 33 (3A) fuse in the under-dash fuse/relay box and the BATT (2A) accessory fuse, or repair the open in the WHT/BLU wire between the BATT (2A) fuse and the outside air temperature gauge control unit connector (22P).[]
11. Turn the ignition switch to ON (II).
12. Measure the voltage between terminal No. 2 and terminal No. 11 of the outside air temperature gauge control unit harness (22P) connector.
Is there battery voltage?
YES - Go to step 13.
NO - Repair the open in the YEL/BLK wire between the No. 30 (7.5A) fuse in the fuse/relay box and the 1G2 (2A) accessory fuse, or repair the open in the YEL/GRN wire between the BATT (2A) fuse and the outside air temperature gauge control unit.[]
13. Turn the ignition switch to LOCK (0).
14. Reconnect the connector (22P) to the outside air temperature gauge control unit.
15. Connect the HDS to the data link connector.
16. Turn the ignition switch to ON (II).
17. Select the BODY ELECTRICAL menu, then select YOP ECU, then DATA LIST, then Outside Temp Sens.
Does the HDS show a temperature?
YES - Troubleshoot the gauge assembly (see page 22-230 of the 2003-04 Accord Service Manual).[]
NO - Replace the outside air temperature gauge control unit.[]*
Actual Air Temperature and Indicated Air Temperature Are Different
NOTE:
*The engine coolant temperature must be lower than 139°F (59°C) before attempting the following troubleshooting.
1. Remove the outside air temperature sensor from the vehicle.
2. Dip the sensor in ice water for several minutes, then measure the resistance between terminals No. 1 and No. 2.
3. Pour hot water on the sensor, and measure the change in resistance between terminal No. 1 and terminal No. 2.*
Is the resistance measurement approximately the same as the scale?
YES - Go to step 4.
NO - Replace the temperature sensor.[]
4. *Connect the temperature sensor to the wire harness.
5. Connect the HDS to the data link connector.
6. Turn the ignition switch to ON (II).
7. Select the BODY ELECTRICAL menu, then select YOP ECU, then DATA LIST, then Outside Temp Sens.
Is the temperature on the HDS and the temperature on the display different?
YES - Troubleshoot the gauge assembly (see page 22-230 of the 2003-04 Accord Service Manual).[]
NO - Replace the outside air temperature gauge control unit.[]*
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