Circuit Tests: Notes

NOTE: Geo uses two types of diagnostic connectors. Duty check Data Link Connector (duty check DLC) and OBD-II Data Link Connector (DLC). In this article, duty check DLC refers to 23-pin diagnostic connector. Both connectors are located next to left strut tower in engine compartment. DLC refers to 16 -pin diagnostic connector located under instrument panel used for scan tool hook-up.

NOTE: Ensure battery condition, cranking speed, and fuel quantity/quality are okay before performing CIRCUIT TESTS .

CIRCUIT TEST DIRECTORY

Malfunction ⁽¹⁾

Chart No.

Inoperative Malfunction Indicator Light

⁽²⁾ B2-1

Malfunction Indicator Light On Steady

⁽²⁾ B2-2

Engine Cranks But Will Not Start

A2-3

No Communication From Data Link Connector

⁽²⁾ B2-4

Fuel Injector Circuit Check/Engine No-Start

A2-5

Fuel System Diagnosis/Circuit Opening Relay Check

A2-7A

Fuel System Diagnosis/Fuel Pressure Check

A2-7B

Fuel System Diagnosis/Fuel Injector Coil Test

⁽³⁾ A2-7C

Fuel System Diagnosis/Fuel Injector Coil Test

⁽⁴⁾ A2-7D

Fuel System Diagnosis/Fuel Injector Balance Test

A2-7E

⁽¹⁾	Before using CIRCUIT TESTS, perform appropriate On-Board Diagnostic (OBD) System Check circuit test to determine starting point. See TESTS W/CODES article.

⁽²⁾	See appropriate TESTS W/CODES article.

⁽³⁾	With coolant temperature at 50-95°F (10-35°C).

⁽⁴⁾	With coolant temperature below 50°F (10°C) or above 95°F (35°C).