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Old 09-27-2007, 01:02 AM   #1
Scooters99PSD
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1293 Code

I have a miss in no7 cyl. This code is coming up 1293 high side open (right).
Anybody know what this means. Thanks for your help.
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Old 09-27-2007, 01:13 AM   #2
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We just met a guy who has been chasing down a miss for 2 years. It was a bad miss. Every contribution test he did came back #2 & #7. He changed out the IDM, which is what that code is linked to. Didn't fix it.

Question? Have you checked the fuel pressure? Reason I ask is he did and it was low. He changed out the fuel pressure regulator and all is good now. Just a thought...
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Old 09-27-2007, 02:37 AM   #3
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Some reading for you....:

AB20 DIAGNOSTIC TROUBLE CODES (DTCs) P1294 AND P1293: CHECK FOR VOLTAGE ON HIGH SIDE CIRCUIT
DTCs P1294 and P1293 indicate an open circuit exists on the high side circuit between the IDM and the injectors. The following table lists the circuits to inspect while performing these pinpoint tests, based on the DTC retrieved during the KOEO On-Demand and Injector Electrical Self Tests.

DTC High Side Injector Bank
P1294 878 (PK/Y) Left
P1293 1087 (O) Right


Key off.
Disconnect both connectors on the bank with the code.
Key on, engine off.
Measure voltage on the suspect high side circuit Pin C on the injector vehicle harness connectors and battery ground.
Is battery voltage present?
Yes No
GO to AB21 . GO to AB24 .

AB21 CHECK INJECTOR RESISTANCE
Key off.
Suspect injector valve cover connectors disconnected.
Install Rotunda Glow Plug Injector Adapter 014-00935 or equivalent.
Measure resistance between high side and low side injector terminals on the adapter tool.
Is resistance less than 5 ohms?
Yes No
Fault may be intermittent. GO to AB15 . GO to AB22 .

AB22 CHECK HARNESS FOR OPEN
Remove valve cover.
Disconnect injector harness connector.
Measure resistance between injector connector and exterior gasket connector.
Is resistance less than 5 ohms?
Yes No
REPLACE injector. RERUN Scan Tool Diagnostic Test. GO to AB23 .

AB23 DETERMINE WHETHER GASKET OR UVC HARNESS HAS FAILED
Disconnect UVC harness from gasket.
Measure resistance across each contact in the gasket.
Is each resistance reading less than 5 ohms?
Yes No
REPLACE UVC harness. REPLACE valve cover gasket.

AB24 CHECK FOR OPEN IN HIGH SIDE CIRCUIT
Key off.
Disconnect IDM.
Both connectors on the bank with the code disconnected.
Using a digital multimeter and the flex tips supplied with the NGS Tester, measure resistance between suspect high side circuit at the IDM connector and Pin C and both suspect injector connectors.
Are both resistance readings less than 5 ohms?
Yes No
Fault may be intermittent. GO to AB15 . REPAIR open in high side circuit.
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Old 09-27-2007, 12:55 PM   #4
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Excellant info Rick. :Thumbup:
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