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I'm going to point out to everyone there is NO WAY to have just a P1693 code present during error code dumping. Yes the P1693 is a companion code and has no really meaning but... "This code indicates there is more code present in the other computer" So if the P1693 is in the P PCU that means there is more codes present in the P ECU. So if there is a P1693 in the P ECU that means there is more codes present in the P PCU. Then even in rare cases seeing the P1693 code in both computers pointing out that both computers have codes. But there is NO WAY for the P1693 to be the only codes present during error code dump. It's totally impossible! The reason I'm posting this is because it seem like everyone is cancelling out at the first P DONE thinking its done. WRONG! There is TWO computers in the truck. P PCU = Powertrain Controller Unit (Passenger side firewall) P ECU = Engine Controller Unit (Driver side of engine block) You should always see both P PCU and P ECU displayed and 2 P DONE's in the display. If you want to see a video of this and how to properly do it please reffer to my web site and watch the video I produced so you can give us acurrate information on your problems your having with your truck. Here is the page with the video of how its done... http://mopar.mopar1973man.com/cummins/2ndgen24v/obd2-error-codes/obd2-error-codes.htm Now the other thing is alot of people are getting error code from OBD II sites or from manuals with the scanners. I'll point out that any code over P1000 is a manufacture specific code that only applies to the that make and model of vehicle so please refer to a proper Factory service manual and get the proper codes. I've got some books listed on my site provided by PDFTown.com http://pdftown.com/Dodge-Ram-2001-Service-Manual.html As for 2nd Gen 24V error codes I copied the error code listing straight out of the Dodge FSM for our truck and made a short PDF file for viewing... http://mopar.mopar1973man.com/cummins/2ndgen24v/obd2-error-codes/error-codes.pdf This will help us diagnose your problem quickly and properly.

Edited by Mopar1973Man

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NO RESPONSE FROM ENGINE CONTROL MODULE

Testing

1. Turn ignition on. Using DRBIII® scan tool, attempt to communicate with Powertrain Control Module (PCM). If scan tool communicates with PCM, go to next step. If scan tool does not communicate with PCM, go to NO RESPONSE FROM ENGINE CONTROL MODULE & POWERTRAIN CONTROL MODULE .

2. Turn ignition off. Check power and grounds for Engine Control Module (ECM). See CHECKING ENGINE CONTROL MODULE POWER & GROUND CIRCUITS under DIAGNOSTIC CIRCUIT CHECK. Repair as necessary. If power and grounds for ECM are okay, go to next step.

3. Ensure ignition is off. Disconnect ECM harness connector. ECM is located on driver's side of engine, just in front of fuel transfer pump and contains a 50-pin connector. Disconnect scan tool from Data Link Connector (DLC). Using DVOM, measure resistance between ground and terminal No. 39 (Dark Green wire) on ECM harness connector. If resistance is 5 ohms or greater, go to next step. If resistance is less than 5 ohms, repair short to ground in Dark Green wire.

4. Ensure ignition is off. Using DVOM, measure resistance of Dark Green wire between terminal No. 39 on ECM harness connector and terminal No. 6 on DLC. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or greater, repair open in Dark Green wire.

5. Ensure ignition is off. Using DVOM, measure resistance of Pink/Dark Blue wire between terminal No. 38 on ECM harness connector and terminal No. 7 on DLC. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or greater, repair open in Pink/Dark Blue wire.

6. Replace and program the ECM.

NO RESPONSE FROM POWERTRAIN CONTROL MODULE

Testing

1. Turn ignition on. Using DRBIII® scan tool, attempt to communicate with Engine Control Module (ECM). ECM may also be referred to as Cummins Controller. If scan tool communicates with ECM, go to next step. If scan tool does not communicate with ECM, go to NO RESPONSE FROM ENGINE CONTROL MODULE & POWERTRAIN CONTROL MODULE .

2. Turn ignition off. Check power and grounds for Powertrain Control Module (PCM). See CHECKING POWERTRAIN CONTROL MODULE POWER & GROUND CIRCUITS under DIAGNOSTIC

CIRCUIT CHECK. Repair as necessary. If power and grounds for PCM are okay, go to next step.

3. Ensure ignition is off. Disconnect Gray 32-pin PCM harness connector C3. Disconnect scan tool from Data Link Connector (DLC). Using DVOM, measure resistance between ground and terminal No. 29 (White/Violet wire) on PCM harness connector C3. If resistance is 5 ohms or greater, go to next step. If resistance is less than 5 ohms, repair short to ground in White/Violet wire.

4. Ensure ignition is off. Ensure Gray 32-pin PCM harness connector C3 is still disconnected. Using DVOM, measure resistance of White/Violet wire between terminal No. 29 on PCM harness connector C3 and terminal No. 14 on DLC. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or greater, repair open in White/Violet wire.

5. Ensure ignition is off. Ensure Gray 32-pin PCM harness connector C3 is still disconnected. Using DVOM, measure resistance of Pink/Dark Blue wire between terminal No. 27 on PCM harness connector C3 and terminal No. 7 on DLC. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or greater, repair open in Pink/Dark Blue wire.

6. Replace and program the PCM.

NO RESPONSE FROM ENGINE CONTROL MODULE & POWERTRAIN CONTROL MODULE

Testing

1. Turn ignition off. Check power and grounds for Engine Control Module (ECM) and Powertrain Control Module (PCM). See DIAGNOSTIC CIRCUIT CHECK . Repair as necessary. If power and grounds for ECM and PCM are okay, go to next step.

2. Ensure ignition is off. Reconnect all disconnected components. Disconnect PCM harness connectors. Turn ignition on. Using DRBIII® scan tool, attempt to communicate with ECM. If scan tool does not communicate with ECM, go to next step. If scan tool communicates with ECM, replace and program the PCM. See appropriate REMOVAL, OVERHAUL & INSTALLATION article.

3. Turn ignition off. Ensure PCM harness connectors are still disconnected. Disconnect scan tool. Disconnect ECM harness connector. Turn ignition on. Using DVOM, measure voltage between ground and terminal No. 7 (Pink/Dark Blue wire) on Data Link Connector (DLC). If voltage is one volt or less, go to next step. If voltage is greater than one volt, repair short to voltage in Pink/Dark Blue wire.

4. Turn ignition off. Ensure scan tool, ECM and PCM are still disconnected. Using a DVOM, measure resistance between terminal No. 7 (Pink/Dark Blue wire) and terminals No. 6 (Dark Green wire) and No. 14 (White/Violet wire) on DLC. If resistance is 5 ohms or greater on both measurements, go to next step. If resistance at either measurement is less than 5 ohms, repair short between SCI transmit circuit and appropriate SCI receive circuit that indicated less than 5 ohms.

5. Ensure ignition is off. Ensure scan tool, ECM and PCM are still disconnected. Using a DVOM, measure resistance between ground and terminal No. 7 (Pink/Dark Blue wire) on DLC. If resistance is 5 ohms or greater, go to next step. If resistance is less than 5 ohms, repair short to ground in Pink/Dark Blue wire.

6. Ensure ignition is off. Ensure scan tool, ECM and PCM are still disconnected. Using DVOM, measure resistance of Pink/Dark Blue wire between terminal No. 38 on ECM harness connector and terminal No. 7 on DLC. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or greater, repair open in Pink/Dark Blue wire.

7. Ensure ignition is off. Ensure scan tool is disconnected. Disconnect negative battery cable. Using DVOM, measure resistance between ground and terminals No. 4 (Black/Light Green wire) and No. 5 (Black/Tan wire) at DLC. If resistance is less than 5 ohms on both measurements, go to next step. If resistance at either terminal is 5 ohms or greater, repair open in appropriate ground circuit that indicated 5 ohms or greater.

8. Replace and program the ECM.

Edited by Mopar1973Man

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