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Home >> Saab >> 1988 >> 900 S, 2D Hatchback, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Fuel Injection System - LH-JETRONIC >> Testing - SAAB >> Component Testing >> System Relay (9000 Series)

System Relay (9000 Series)

  1. Using a jumper wire, connect terminal No. 21 of ECU connector to ground. Check for voltage at terminal No. 9 and No. 2 of air mass meter connector. If voltage is present at air mass meter, system relay and associated wiring is okay. If no voltage is present, go to next step.
  2. Check for voltage at terminal No. 30 and No. 86 (RED wire) of relay. See Figure . If voltage is not present, check wiring to positive terminal. Connect relay terminal No. 85 to ground. Check for voltage at terminal No. 87 (GRY/WHT wire). If voltage is present, go to next step. If voltage is not present, replace system relay.
  3. Check wiring between relay terminal No. 85 and ECU connector terminal No. 21. Check wiring between relay terminal No. 87 (GRY/WHT wire) and fuel pump relay terminal No. 86 (through pressure switch). Check wiring between relay terminal No. 87B (BRN/WHT wire) and air mass meter terminal No. 2.
CAUTION: The following test is to be performed with engine running. Use only a high quality multimeter or approved Saab multimeter when performing voltage checks in the following steps.
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