1993 Geo Metro XFiFACTORY OEM SERVICE PROCEDURE

Retrieving Codes

  1. Perform diagnostic circuit check before diagnosing vehicle using self-diagnostic system. See appropriate DIAGNOSTIC CIRCUIT CHECK chart under DIAGNOSTIC CODE CHARTS  .
  2. Fault codes can be retrieved using a scan tester connected to Data Link Connector (DLC) or by counting flashes of Malfunction Indicator Light (MIL) after grounding either DIAG SW connector in fuse block or diagnostic request terminal in duty check data link connector, located on left side of firewall. See Fig 1 .
  3. To retrieve code(s) using DIAG SW connector in fuse block, remove spare fuse from fuse block and insert into DIAG SW connector terminal. See Fig 1 . Turn ignition on and observe MIL to read fault code(s). Proceed to appropriate chart(s) under DIAGNOSTIC CODE CHARTS to diagnose fault codes.
  4. To retrieve code(s) using the duty check data link connector, connect jumper between duty check data link connector terminals No. 2 and 4. See Fig 1 . Turn ignition on and observe MIL to read fault code(s). Proceed to appropriate chart(s) under DIAGNOSTIC CODE CHARTS to diagnose fault codes.
  5. If no fault codes are stored, MIL will flash Code 12, indicating ECM diagnostic system is operating. If fault codes are stored, code will flash 3 times, starting with the lowest code. Proceed to appropriate chart(s) under DIAGNOSTIC CODE CHARTS to diagnose fault codes.
Fig 1: Data Link Connector Location
G93B78361Courtesy of GENERAL MOTORS CORP.
FAULT CODE IDENTIFICATION

Code Circuit Affected Probable Cause
13 Oxygen Sensor Signal Voltage Does Not Change
14 Coolant Temperature Sensor Low Temperature Indicated
15 Coolant Temperature Sensor High Temperature Indicated
21 Throttle Position Sensor Signal Voltage High
22 Throttle Position Sensor Signal Voltage Low
23 Intake Air Temp. Sensor Low Temperature Indicated
25 Intake Air Temp. Sensor High Temperature Indicated
31 MAP Sensor Low Voltage Input
41 Ignition Signal No Signal
42 Camshaft Position Sensor No Signal
51 EGR System EGR VSV Inoperative
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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.

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