LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Isuzu >> 2003 >> Ascender 5.3 P, 4WD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System & Component Testing - 5.3L >> Fuel Systems >> Fuel Pump Electrical Circuit Diagnosis >> Test Description
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Test Description

The numbers below refer to step numbers on diagnostic procedure.

  1. - This step determines if condition is located on coil side or on switch side of fuel pump relay.
  2. - This step verifies that PCM is providing voltage to fuel pump relay.
  3. - This step tests for an open in ground circuit to fuel pump relay.
  4. - This step determines if a voltage is constantly being applied to fuel pump relay.
  5. 13  - This step determines if condition with circuit is intermittent.