2008 Suzuki Reno AutomaticFACTORY OEM SERVICE PROCEDURE

Fuel Pump Relay Circuit Check: Troubleshooting

TROUBLESHOOTING CHART

Step Action Value (s) Yes No
1
  1. Turn the ignition OFF for 10 sec.
  2. Turn the ignition ON.
  3. Listen for in-tank fuel pump operation.

Does the fuel pump operate for the time specified?		 2 sec. System OK Go to Step 2
2
  1. Turn the ignition OFF.
  2. Disconnect the fuel pump relay.
  3. Connect a test light between the fuel pump relay connector terminal 30 and ground.
  4. Turn the ignition ON.

Is the test light ON?		 - Go to Step 3 Go to Step 8
3
  1. Turn the ignition OFF.
  2. Connect a test light between the fuel pump relay connector terminal 86 and B (+).
  3. Turn the ignition ON.
  4. With the ignition ON, the test light should light for the time specified.

Is the test light ON?		 2 sec. Go to Step 4 Go to Step 9
4
  1. Turn the ignition OFF.
  2. Connect a test light between the fuel pump relay connector terminal 30 and ground.

Is the test light ON?		 - Go to Step 5 Go to Step 11
5 Check for an open or short to ground in the wire between the fuel pump relay connector terminal 87 and the fuel pump connector terminal 3.
Is the problem found?		 - Go to Step 6 Go to Step 7
6
  1. Repair the wire between the fuel pump relay connector terminal 87 and the fuel pump connector terminal 3.
  2. Install the fuel pump relay.
  3. Turn the ignition OFF for 10 sec.
  4. Turn the ignition ON.

Does the fuel pump operate for the time specified?		 2 sec. System OK -
7
  1. Replace the fuel pump relay.
  2. Turn the ignition OFF for 10 sec.
  3. Turn the ignition ON.

Does the fuel pump operate for the time specified?		 2 sec. System OK -
8 Check for an open wire between the fuel pump relay connector terminal 30 and the battery.
Is the problem found?		 - Go to Step 13 -
9 Check for an open wire between the fuel pump relay connector terminal 85 to the Engine Control Module (ECM) connector terminal C42.
Is the problem found.		 - Go to Step 10 Go to Step 12
10
  1. Repair the wire between the fuel pump relay connector terminal 85 to the ECM connector terminal C42.
  2. Install the fuel pump relay.
  3. Turn the ignition OFF for 10 sec.
  4. Turn the ignition ON.

Does the fuel pump operate for the time specified?		 2 sec. System OK -
11
  1. Replace the fuse Ef18 or repair the wire between the fuel pump relay connector terminal 30 and the battery.
  2. Install the fuel pump relay.
  3. Turn the ignition OFF for 10 sec.
  4. Turn the ignition ON.

Does the fuel pump operate for the time specified?		 2 sec. System OK -
12
  1. Turn the ignition OFF.
  2. Replace the ECM.
  3. Turn the ignition ON.

Does the fuel pump operate for the time specified?		 2 sec. System OK -
13
  1. Replace the fuse Ef18 or repair the wire between the fuel pump relay connector terminal 30 and the ignition system
  2. Install the fuel pump relay.
  3. Turn the ignition OFF for 10 sec.
  4. Turn the ignition ON.

Does the fuel pump operate for the time specified?		 2 sec. System OK -
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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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