A3

A3 CHECK FOR INTERMITTENT BATTERY VOLTAGE AT THE HCU CONNECTOR

- Install the Breakout Box (BOB). Ensure that the correct overlay is installed.

- Place a jumper wire from BOB Pin 19 to Pin 1 or Pin 14.

- Set up a DVOM to measure the voltage between BOB Pin 17 and Pin 1 or Pin 14.

- While monitoring the voltage, tap the anti-lock hydraulic control unit lightly with a rubber mallet to simulate conditions of rough road driving.

Does the voltage fall below 9 volts at any time?

> Yes
repair the source of the high resistance or open circuit in one of the following: Circuit 532 (O/Y) between the HCU and ABS power relay, Circuit 537 (T/Y) between battery and ABS power relay. Go to Pinpoint Test A5. A5

> No
Go to Pinpoint Test A4. A4