PINPOINT TEST KF: Fan Control (FC): 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.
This pinpoint test is intended to diagnose the following:
- low fan control (LFC), medium fan control (MFC), high fan control (HFC) relays
- harness circuits HFC, LFC, MFC, VPWR
- powertrain control module (PCM) (12A650)
Three Speed Fan Operation
Although the PCM output circuits are called low, medium, and high fan control (FC), cooling fan operation is controlled by a combination of these outputs.
Refer to ENGINE CONTROL COMPONENTS for system information.
CONNECTOR PIN REFERENCE CHART
| Pin | Circuit |
|---|---|
| 1 | LFC (Low Fan Control) |
| 2 | VPWR (Vehicle Power) |
CONNECTOR PIN REFERENCE CHART
| Pin | Circuit |
|---|---|
| 1 | MFC (Medium Fan Control) |
| 2 | VPWR (Vehicle Power) |
CONNECTOR PIN REFERENCE CHART
| Pin | Circuit |
|---|---|
| 1 | HFC (High Fan Control) |
| 2 | VPWR (Vehicle Power) |
CONNECTOR PIN REFERENCE CHART
| Pin | Circuit |
|---|---|
| 3 | GND (Ground) |
| 1, 2 | LSFAN PWR (Low Speed Fan Power) |
CONNECTOR PIN REFERENCE CHART
| Pin | Circuit |
|---|---|
| 2 | MSFAN PWR (Medium Speed fan Power) |
| 1 | GND (Ground) |
| 2 | HSFAN PWR (High Speed Fan Power) |
CONNECTOR PIN REFERENCE CHART
| Pin | Circuit |
|---|---|
| B36 | HFC (High Fan Control) |
| B18 | MFC (Medium Fan Control) |
| B34 | LFC (Low Fan Control) |