Code P1320

MAMOORE

MEMBER
2000 INFINITI I30

6 cyl All Wheel Drive Automatic 98, oo miles

i have a 2000 I30 infinity and service engine soon light is on and I need to get my car inspected like yesterday. I took my car to Advance Auto Parts to get a reading. I was told that it was reading ignition signal, primary circuit intermittent. Code P1320. Took my car to a mechanic he also did a diagnostic reading and told me the same thing. He did something and the light went off. He reset the mileage and told me that I needed to drive anywhere from 200 miles to 250 miles. Well I drove less than 10 miles and the light popped back on. So, I still have the same problem. My car still needs inspecting. What do you suggest? Please help.

4 Replies

ZACKMAN

MECHANIC
4,202 POSTS

Hello,

It sounds like you have an ignition coil that is out, here is a guide to help you confirm.

https://www.2carpros.com/articles/how-to-test-an-ignition-system

DTC Confirmation Test

Malfunction is detected when ECM does not receive signal from ignition primary circuit during engine
cranking or running. Possible causes are:
Ignition primary circuit open or shorted.
Defective power transistor (integral with ignition coil).
Defective condenser.
Defective Crankshaft Position (CKP) sensor (REF).
CKP sensor (REF) circuit open or shorted.
To set DTC, turn ignition on. Select DATA MONITOR with scan tool. Start engine. If engine does not
start, crank engine for at least 5 seconds.
Procedure
1. Turn ignition off and restart engine. If engine starts, go to step 8 . If engine does not start, leave
ignition on. Measure voltage between ground and ECM terminals No. 110 and 112. See Fig. 1 and
Fig. 2 . If battery voltage exists, go to next step. If battery voltage does not exist, repair power
supply circuit. See ENGINE CONTROL MODULE (ECM) under COMPUTERIZED ENGINE
CONTROLS in SYSTEM & COMPONENT TESTING article.
2. Turn ignition off. Disconnect condenser harness connector. See Fig. 38 . Turn ignition on.
Measure voltage between ground and condenser harness connector Red wire. If battery voltage
exists, go to step 6 . If battery voltage does not exist, go to next step.
3. Turn ignition off. Disconnect ECM relay. See Fig. 39 . Check continuity of Red wire between
ECM relay harness connector terminal No. 7 and condenser harness connector. See Fig. 16 . Also
check circuit for short to ground and short to voltage. Repair as necessary and retest system. If circuit is okay, go to next step.
4. Measure voltage between ground and ECM relay harness connector terminal No. 6 (Purple wire).
If battery voltage exists, go to next step. If battery voltage does not exist, repair open or short
circuit and retest system. See WIRING DIAGRAMS article.
5. Using jumper wires, apply battery voltage and ground to ECM relay terminals No. 1 and 2. See
Fig. 16 . Check continuity between terminals No. 3 and 5. Also check continuity between
terminals No. 6 and 7. Continuity should exist. Remove jumper wires. Continuity should not exist.
If operation is as specified, go to step 12 . If operation is not as specified, replace ECM relay and
retest system.
6. Turn ignition off. Check continuity between engine ground and condenser harness connector
Black wire. Also check circuit for short to voltage. Repair as necessary and retest system. If
ground circuit is okay, go to next step.
7. Measure resistance between condenser terminals. Resistance should be more than one megohm at
77°F (25°C). If resistance is as specified, go to next step. If resistance is not as specified, replace
condenser and retest system.
8. Turn ignition off. Reconnect all harness connectors. Disconnect ignition coil harness connectors.
Turn ignition on. Measure voltage between ground and each ignition coil harness connector
terminal No. 3 (Red wire). If battery voltage exists, go to next step. If battery voltage does not
exist, repair open or short between ignition coil harness connector and ECM relay. See WIRING
DIAGRAMS article. Retest system.
9. Turn ignition off. Check continuity between engine ground and each ignition coil harness
connector terminal No. 2 (Black wire). Also check circuits for short to voltage. Repair as
necessary and retest system. If ground circuits are okay, go to next step.
10. Disconnect ECM harness connector. See Fig. 1 . Check continuity between each ignition coil
harness connector terminal No. 1 and ECM harness connector. See IGNITION COIL/ECM
CIRCUIT IDENTIFICATION table. See Fig. 2 . Also check circuits for short to ground and
short to voltage. Repair as necessary and retest system. If circuits are okay, go to next step.
11. Measure resistance between ignition coil terminals No. 2 and 3. If resistance is zero ohms, replace
ignition coil and retest system. If resistance is more than zero ohms, go to next step.
12. No problem is indicated at this time. Problem may be intermittent. See TESTING PROCEDURE
under SELF-DIAGNOSTIC SYSTEM in SELF-DIAGNOSTICS - INTRODUCTION article.

Figure 1