Instrument Cluster Test 4A - Speedometer Not Operating Properly
NOTE:
Perform INSTRUMENT CLUSTER TEST 1A
before proceeding with this test. For connector terminal identification, refer to CONNECTOR IDENTIFICATION
. For wiring diagrams, refer to WIRING DIAGRAMS
. Refer to INSTRUMENT PANEL
article. After each repair, perform TEST VER-1A
.
CAUTION:
Always turn ignition switch to OFF position prior to disconnecting any module connector. Ensure all connectors are clean and tight.
- Using scan tool, access ELECTRO/MECH CLUSTER menu. Read cluster type (US or Metric). If cluster type does not match application, replace instrument cluster circuit board. If cluster type matches application, go to next step.
- Using scan tool, check for Powertrain Control Module (PCM) diagnostic trouble codes. If trouble code(s) exist, repair as required. See TESTS W/CODES article in the ENGINE PERFORMANCE Section. If no trouble code(s) exist, go to next step.
- Using scan tool, actuate speedometer gauge. If speedometer moves to it's calibration points, go to INSTRUMENT CLUSTER TEST 4B . See GAUGE CALIBRATION POINTS table under INSTRUMENT CLUSTER TEST 2A. If speedometer does not move to it's calibration points, go to next step.
- Remove instrument cluster. Loosen screws holding speedometer to circuit board. Ensure screws do not touch circuit board. Using an ohmmeter, measure resistance across speedometer gauge coils No. 1 and 2. See Fig 1 . If resistance across each coil is not about 280 ohms, replace speedometer. If resistance across each coil is about 280 ohms, replace circuit board.