Pinpoint Test H: Fuel Control: Introduction
WARNING:
TO PREVENT THE RISK OF HIGH-VOLTAGE SHOCK, ALWAYS FOLLOW PRECISELY ALL WARNINGS AND SERVICE INSTRUCTIONS, INCLUDING INSTRUCTIONS TO DEPOWER THE SYSTEM. THE HIGH-VOLTAGE HYBRID SYSTEM UTILIZES APPROXIMATELY 300 VOLTS DC, PROVIDED THROUGH HIGH-VOLTAGE CABLES TO ITS COMPONENTS AND MODULES. THE HIGH-VOLTAGE CABLES AND WIRING ARE IDENTIFIED BY ORANGE HARNESS TAPE OR ORANGE WIRE COVERING. ALL HIGH-VOLTAGE COMPONENTS ARE MARKED WITH HIGH-VOLTAGE WARNING LABELS WITH A HIGH-VOLTAGE SYMBOL. FAILURE TO FOLLOW THESE INSTRUCTIONS MAY RESULT IN SERIOUS PERSONAL INJURY OR DEATH.
WARNING:
WHILE CONDUCTING TESTS ON A HOT ENGINE TAKE ALL SAFETY PRECAUTIONS TO PREVENT SKIN CONTACT WITH HOT ENGINE COMPONENTS. FAILURE TO FOLLOW THESE INSTRUCTIONS MAY RESULT IN PERSONAL INJURY.
This pinpoint test is intended to diagnose the following:
- heated oxygen sensor(s) (HO2S)
- fuel injector(s) (9F593)
- vacuum system
- harness circuits: HO2S11, HO2S12, HTR11, HTR12, UO2SPC, SIGRTN, and VPWR
- powertrain control module (PCM) (12A650)
HO2S CONNECTOR PINS REFERENCE CHART
| Pin | Circuit |
|---|---|
| 3 | SIGRTN (Signal Return) |
| 4 | HO2S Signal (HO2S Signal Circuit) |
| 1 | VPWR (Vehicle Power) |
| 2 | HO2S Heater (HO2S Heater) |
UNIVERSAL HO2S CONNECTOR PINS REFERENCE CHART
| Pin | Circuit |
|---|---|
| 1 | UO2SPC (Universal Oxygen Sensor Pumping Current) |
PCM CONNECTOR PINS REFERENCE CHART
| Pin | Circuit |
|---|---|
| T18 | HO2S Heater (HO2S Heater) |
| B67 | VPWR (Vehicle Power) |
| E64 | SIGRTN (Signal Return) |
| T16 | HO2S Signal (HO2S Signal Circuit) |
| E23 | UO2SPC (Universal Oxygen Sensor Pumping Current) |