How to avoid Code 42 after a plenum pull - ZR-1 Net Registry Forums

Ccmano · 12-20-2019

To date I’ve done more plenum pulls than I can count and other than a blown INJ1 fuse or a finicky coolant fill I’ve never run into any issues with codes when finished. Recently in doing one for a friend we ended up with a code 42 when it was all buttoned up. Very irritating. After running some diagnostics, specifically the FSM diagnostic tree for code 42, we determined that the most likely issue was a bent pin at the main DIS module connector. This means pulling the plenum again. Which also means draining and later refilling coolant. Some searches on the forum revealed that this is not an uncommon issue because of the awkward access to the main DIS connector for reassembly. It doesn’t take much for even a slight misalignment to cause a bent connector pin. That’s what we found, a bent pin.

It occurred to me that if I added one step to the reassembly process I could assure no code 42 and the associated work of a second plenum pull and coolant drain/refill. Its simple. (Note, you will need a Tech1 or code reader of some type.)
When you get to the point where the plenum is on (not bolted down) and all the DIS connectors are in place, stop. Now connect all the other electronic connectors that came off in the process, if only temporarily. The MAT sensor, Idle Air Motor, the Throttle Position Sensor and the MAP Sensor. If you disconnected your battery, reconnect it. At this point simply turn the ignition on. (Don’t turn the engine over!) Your code reader will now tell you if there are any codes. A code 42 will instantaneously come on if it’s there. If there is no code 42 your good to go. If you do find a code 42 clear it, cycle the ignition off and back on (don’t turn the engine over). If the code comes back you likely have a bent DIS connector pin. You can now more easily go back and check the connector pins. You just saved yourself a full second plenum pull.
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12-20-2019	#1
Ccmano Join Date: Jun 2006 Location: Sparks, NV Posts: 2,843	How to avoid Code 42 after a plenum pull To date I’ve done more plenum pulls than I can count and other than a blown INJ1 fuse or a finicky coolant fill I’ve never run into any issues with codes when finished. Recently in doing one for a friend we ended up with a code 42 when it was all buttoned up. Very irritating. After running some diagnostics, specifically the FSM diagnostic tree for code 42, we determined that the most likely issue was a bent pin at the main DIS module connector. This means pulling the plenum again. Which also means draining and later refilling coolant. Some searches on the forum revealed that this is not an uncommon issue because of the awkward access to the main DIS connector for reassembly. It doesn’t take much for even a slight misalignment to cause a bent connector pin. That’s what we found, a bent pin. It occurred to me that if I added one step to the reassembly process I could assure no code 42 and the associated work of a second plenum pull and coolant drain/refill. Its simple. (Note, you will need a Tech1 or code reader of some type.) When you get to the point where the plenum is on (not bolted down) and all the DIS connectors are in place, stop. Now connect all the other electronic connectors that came off in the process, if only temporarily. The MAT sensor, Idle Air Motor, the Throttle Position Sensor and the MAP Sensor. If you disconnected your battery, reconnect it. At this point simply turn the ignition on. (Don’t turn the engine over!) Your code reader will now tell you if there are any codes. A code 42 will instantaneously come on if it’s there. If there is no code 42 your good to go. If you do find a code 42 clear it, cycle the ignition off and back on (don’t turn the engine over). If the code comes back you likely have a bent DIS connector pin. You can now more easily go back and check the connector pins. You just saved yourself a full second plenum pull. H __________________ 90'ZR-1 #1461 Red/Black Ported Intake, Degreed Cams, OBX Headers & Exhaust, Fidanza FW, Secondary Delete, Custom tune, C6 GS Wheels. Sold 08 C6 Z51 Crystal Red Metallic Sold Vararam Intake, Tune, Sold 05 C6 Z51 Red/Black Sold 90'ZR-1 #1723 Black/Gray Sold but not forgotten 91' Z51 L98 White Vert. My First, you always remember your first. Sold.