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Home >> Suzuki >> 2000 >> Vitara JS, 2D Utility, 1.6, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics - Tests >> System Tests >> Circuit Test A-3: Pcm Power & Ground Circuit Check/Engine No Start
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Circuit Test A-3: Pcm Power & Ground Circuit Check/Engine No Start

NOTE: For PCM connector and terminal identification, see PIN VOLTAGE/CIRCUIT RESISTANCE CHARTS article.
  1. Observe main relay (located in underhood fuse box) while cycling ignition switch from ON to OFF position. If no sound is heard at relay, go to next step. If sound is heard at relay, go to step  4 .
  2. Check condition of main fuse located in engine compartment relay/fuse box. If fuse is blown, check for a short circuit and repair as necessary. If fuse is okay, go to next step.
  3. Turn ignition off. Remove main relay. Inspect and repair relay terminals if necessary. Using DVOM, check continuity between relay terminals "A" and "B". See Fig 1 . No continuity should be indicated. Measure resistance between terminals "C" and "D". Resistance should be 79-95 ohms. Use fused jumper wires to connect battery voltage and ground to terminals "C" and "D". There should now be continuity between terminals "A" and "B". If test results are not as specified, replace main relay. If relay is okay, go to next step.
    Fig 1: Testing Main Relay (Vitara 4-Cylinder)
    G99B51053Courtesy of SUZUKI OF AMERICA CORP.
  4. Turn ignition off. Disconnect PCM harness connectors. Reinstall main relay. Turn ignition on. Measure voltage between ground and terminal No. C51-3-20, also between ground and terminal No. E61-9 at PCM harness connector. If voltage is 10-14 volts, go to next step. If voltage is not as specified, repair open in Black/Red wire between MAIN fuse and main relay, in Blue wire between main relay and PCM, or Black/White wire between ignition switch and PCM. Retest system.
    NOTE: For PCM connector and terminal identification, see PIN VOLTAGE/CIRCUIT RESISTANCE CHARTS article.
  5. Connect a fused jumper wire between ground and PCM harness connector terminal No. E61-9. Turn ignition on. Using DVOM, measure voltage between ground and PCM harness connector terminals No. C51-3-4 and C51-3-15. If voltage is 10-14 volts, check for continuity to ground on PCM harness connector terminals No. C51-2-28 and C51-3-17 (Black/Blue wires). Also check for continuity to ground on harness connector terminal No. C51-3-6 (Black/Green wire). If ground circuits are okay, replace PCM and retest system. If voltage is not as specified, go to next step.
  6. Retest main relay by cycling ignition switch from ON to OFF position. If sound is heard at relay, retest main relay. See step  3 . If relay is okay, or if no sound is heard at relay, repair open circuit in Black/Red wire between MAIN fuse and main relay or in Blue/Black wire between main relay and PCM.
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