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1999 service manual? Rate Topic: -----

#1 User is offline   wilke_jb 

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  • Engine: 3.8L V6
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Posted 20 July 2011 - 11:57 AM

I have searched the forum pretty carefully and cannot find what I need. I have a 1999 Firbird with the 3.8L v6. I have an intermittant crank but no start problem. I get a Code P1518 - which has to do with commuication between the TACM and PCM. I have replaced the Throttle pedal with computer and the throttle body. It will start sometimes. I have also checked the wiring harness and connectors pretty extensively. I downloded the 98 manual, but the v6 in that year had a cable control on the throttle and therfore doesn't help me. I bought a "FULL" service manual from e-bay but that didn't have anything close to what I needed. I need a 1999 service manual BAD. Please help point me in the right direction.
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#2 User is offline   GaryDoug 

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Posted 20 July 2011 - 02:25 PM

View Postwilke_jb, on 20 July 2011 - 11:57 AM, said:

I have searched the forum pretty carefully and cannot find what I need. I have a 1999 Firbird with the 3.8L v6. I have an intermittant crank but no start problem. I get a Code P1518 - which has to do with commuication between the TACM and PCM. I have replaced the Throttle pedal with computer and the throttle body. It will start sometimes. I have also checked the wiring harness and connectors pretty extensively. I downloded the 98 manual, but the v6 in that year had a cable control on the throttle and therfore doesn't help me. I bought a "FULL" service manual from e-bay but that didn't have anything close to what I needed. I need a 1999 service manual BAD. Please help point me in the right direction.


Manual source: www.helminc.com

Sorry, they cost quite a bit and aren't available new anywhere else that I know of. It will look just like the one you downloaded, but in paper form the size of 2 or 3 phone books. Helms doesn't offer them on CD.

Here is a used one: http://www.factoryau...manual-set.aspx

I have read that a low battery can set the P1518 code, so I would re-check the power and ground wires going to the TACM. And this may not be a problem with the throttle control at all as a low voltage condition can cause the same fault.

This post has been edited by GaryDoug: 20 July 2011 - 02:32 PM

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1998 Trans Am - LS1/A4 - all stock and almost all original - one owner - driven daily
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#3 User is offline   Brokenhope81 

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Posted 20 July 2011 - 02:33 PM

DTC P1518 Throttle Actuator Control (TAC) Module Serial Data Circuit

Circuit Description
The TAC module and the PCM communicate via a dedicated serial data circuit. This serial data circuit is separate from any other serial data circuit on the vehicle. Accurate transmitting and receiving of serial data requires not only good circuit integrity but also adequate system voltage. This diagnostic monitors the accuracy of the serial data transmitted between the TAC module and the PCM. If the PCM/TAC module detects a loss of data or invalid data, this DTC sets.

Conditions for Running the DTC
The ignition switch is in the crank or run position.

Conditions for Setting the DTC
Invalid or missing serial data messages are detected for a predetermined amount of time.

Action Taken When the DTC Sets
The PCM will illuminate the malfunction indicator lamp (MIL) during the first trip in which the diagnostic runs and fails.
If equipped with traction control, the PCM will command the EBTCM via the serial data circuit to turn OFF traction control and illuminate the TRACTION OFF lamp.
The PCM will store conditions which were present when the DTC set as Freeze Frame/Failure Records data.
Conditions for Clearing the MIL/DTC
The PCM will turn OFF the malfunction indicator lamp (MIL) during the third consecutive trip in which the diagnostic has run and passed.
The history DTC will clear after 40 consecutive warm-up cycles have occurred without a malfunction.
The DTC can be cleared by using a scan tool.
Diagnostic Aids
Inspect for the following:


Important
DTC P1518 sets if the battery voltage is low or the PCM is replaced/reflashed. If the customers concern is slow cranking or no crank because battery voltage is low, ignore DTC P1518. Clear any DTCs from memory that may have set from the low battery voltage condition.


The following could cause an intermittent condition:

Many situations may lead to an intermittent condition. Perform each inspection or test as directed.

Important: : Remove any debris from the connector surfaces before servicing a component. Inspect the connector gaskets when diagnosing or replacing a component. Ensure that the gaskets are installed correctly. The gaskets prevent contaminate intrusion.


Loose terminal connection

- Use a corresponding mating terminal to test for proper tension. Refer to Testing for Intermittent Conditions and Poor Connections , and to Connector Repairs in Wiring Systems for diagnosis and repair.

- Inspect the harness connectors for backed out terminals, improper mating, broken locks, improperly formed or damaged terminals, and faulty terminal to wire connection. Refer to Testing for Intermittent Conditions and Poor Connections , and to Connector Repairs in Wiring Systems for diagnosis and repair.

Damaged harness--Inspect the wiring harness for damage. If the harness inspection does not reveal a problem, observe the display on the scan tool while moving connectors and wiring harnesses related to the sensor. A change in the scan tool display may indicate the location of the fault. Refer to Wiring Repairs in Wiring Systems for diagnosis and repair.

Inspect the powertrain control module (PCM) and the engine grounds for clean and secure connections. Refer to Wiring Repairs in Wiring Systems for diagnosis and repair.

I found that on another forum on a google search. I hope you can get that up and running I'm having issues with a throttle body right now I need to get replaced I'll let you know if i get that code after I'm done working on it..won't be till this weekend though.
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#4 User is offline   GaryDoug 

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Posted 20 July 2011 - 02:40 PM

You guys should communicate with each other. Jason may have a spare throttle body to sell now!
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#5 User is offline   wilke_jb 

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  • Engine: 3.8L V6
  • Transmission: 5 spd manual

Posted 21 July 2011 - 04:31 AM

WOW - thanks for all the replies. I may have found the problem last night. After reading through many post on this forum and others - someone mentioned an ignition relay causing this problem. I switched the ign relay with one from the fan (same numbers on the relays) and voila! Started right up, switched them back, same problem, switched again and started just fine. I will drive it the next few days and post back if that doesn't solve it. Thanks again for all the help.
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