Power Circuits

WARNING: This page is about a different car, the 1994 Mazda Navajo and 1994 Mazda B4000. However, it is still accessible from the selected car via links, so may be relevant.

Using a voltmeter, check for battery voltage between PCM terminal No. 1 (constant battery power) and ground. Check for battery voltage at terminals No. 37 and 57 with ignition on. If battery voltage is not present, power is not being supplied from EEC power relay. See CIRCUIT TEST B in appropriate G - TESTS W/ CODES articles in the ENGINE PERFORMANCE section below.

TESTS W/CODES (for B4000)
TESTS W/CODES (for Navajo)

Fig 1: PCM 60-Pin Connector Terminal ID (B4000 & Navajo)

Courtesy of MAZDA MOTORS CORP.

ECU/PCME LOCATION

Application	Location
B4000 & Navajo	LR Of Engine Compartment

Fig 2: Testing Engine Control Unit (ECU)

Courtesy of MAZDA MOTORS CORP.