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. Connector is 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⁾

Circuit Test

No Malfunction Indicator Light (MIL)

⁽²⁾ A1-1

Malfunction Indicator Light (MIL) On Steady

⁽²⁾ A1-2

Engine Cranks But Will Not Run

A1-3

No Communication From Data Link Connector

⁽²⁾ A1-4

Fuel Injector Circuit Check/Engine No-Start

A1-5

Fuel System Diagnosis/Circuit Opening Relay Check

A1-7A

Fuel System Diagnosis/Fuel Pressure Check

A1-7B

Fuel System Diagnosis/Fuel Injector Coil Test

⁽³⁾A1-7C

Fuel System Diagnosis/Fuel Injector Coil Test

⁽⁴⁾A1-7D

Fuel System Diagnosis/Fuel Injector Balance Test

A1-7E

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

⁽²⁾	See the 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).