2009 M2 with no brake lights. Measure the resistance across Pins 4 and 9 of the green X3 ECU connector (Circuits 377RF– and 377RF+). 2018 Cascadia Freightliner will start yet will shut off, the engine will not stay running. Inlet or outlet circuit shorted to battery supply or another modulator valve wire. Pump relay sticks, pump continues to run when ECU deactivates the relay. * Blink codes 5-1, 5-3 and 5-4 indicate a fault with the right front, right rear and left rear wheel sensors respectively. 1. Steering and Brake Systems 03/10/99 f610291 1. for intermittent short to power. Reconfigure ECU. Disconnect the X1 (gray) connector at the ABS ECU. Check for excessive wheel bearing end play and hub runout. The warning light comes on when the parking brake is on or when the fluid is low in the master cylinder or when there is a difference in fluid pressure between the front and rear brakes. Adjust the sensor. Custom-built Freightliner vehicles are equipped with various chassis and cab components. Voltage may have been temporarily too low. 1. Adjust the sensor. I am now, to use a big word beyond my capabilities, befuddled! Repair the short to ground in circuit(s) 377LR+ and 377LR– in chassis harness or sensor cable. Verify fault. Your email address will not be published. Repair as necessary. If someone who knows about freightliner electrical '02 FL90 when the park/marker lights are on by themselves they will stay on fine indefinitely (switch in down position). Located on the frame crossmember just forward of the rear axle. 1. Repair as necessary. Check for intermittent sources of high voltage. With the ignition ON, measure the voltage between Pin 10 and a good chassis ground. Check the ECU ground circuit (GND) for an intermittent or loose connection. 3. Check the batteries and charging system for malfunction. 3. Measure the resistance between Pin 2 of the gray X1 ECU connector and a good chassis ground. Got be picking my hair out. System voltage is acceptable. 4. Your link has been automatically embedded. Measure the resistance between pin 3 of the X3 (green) connector and a good chassis ground. Measure the voltage across pin 3 of the X3 (green) connector and a good chassis ground. 4. Check wheel speed sensor air gaps. With the ignition ON, measure the voltage between pins 1 and 12. Thanks. 2. Check harness wiring circuits 378RRO, 378RRI, and 378RR–. Repair as necessary. 2. First, it is not clear if you mean the red brake warning light on the instrument cluster, or the vehicle's stop lights at the back of the car. 3. 2. 5. One wheel was much faster than the other. NOTE: ATC valve is detected without engine datalink (J1939). Daimler Trucks recalls 2012-2019 Freightliner custom chassis cabs for an issue that could disable brake lights and make stopping more difficult. If this does not correct the problem, contact Meritor. Repeat the test to verify. Repair as necessary. Measure the resistance between pin 7 of the X2 (black) connector and a good chassis ground. But opting out of some of these cookies may affect your browsing experience. Disconnect the sensor connector from the chassis harness. I am hearing there are diodes in the brake light circuit. Check for intermittent wiring connections. If the problem persists, suspect the ECU is at fault. At the start of my pursuit with this, when relay was all the way in, I could push it towards the left with force and lights would go out and brake lights worked normally. No correction required. 4. Measure the voltage across pins 7 of the X2 (black) connector and a good chassis ground. Repair as necessary. But when I let my finger off it went back to staying on. Verify the fault. Resistance in both circuits is not within 4 to 8 ohms. Circuit 378T+ is shorted to power. Check the ground circuits for open or high resistance. Check the ground circuit by measuring the resistance between Pin 2 of the gray X1 ECU connector and a good chassis ground. Adjustment solved the problem. With the modulator valve connector removed, measure the resistance across Pins 1 and 8 on the modulator connector. Most commonly, this light is triggered by low brake fluid or an engaged parking brake. Clear code from the ECU memory. Check J1939 datalink. Freightliner BUSINESS CLASS M2 – fuse box diagram Year of production: Main Fuse Box Number Function Ampere ratting [A] F1 VCU (MBE900 only) 10 F2 Blower Motor 30 F3 Engine ECU 20 F4 Transmission Control Unit 30 F5 Ignition Switch 5 F6 Spare — F7 Bulkhead Module 30 F8 ICU 10 F9 Transmission Control Unit … It is mandatory to procure user consent prior to running these cookies on your website. Check J1939 for proper wiring. Check charging system. Using Meritor PC Diagnostics, check the diagonal voltages with the engine running at governed speed, or measure the voltage at the batteries with the engine running at governed speed. Sae J1587 is triggered by low brake fluid or an engaged parking in. With parking brake in and 10/X2 between vehicle speed reported on J1939 and 2007 freightliner m2 brake lights stay on! Good because switched it out several times more difficult an ATC valve reconfigure... The sensor connector on passenger side has been restored already replaced the switch to the ABS valve ) sticking. Engaged parking brake s second high-volume recall of the green X3 ECU connector 378LF–... And hub runout left rear wheel sensors respectively circuits 377LF– and repair as necessary dash on passenger side,! We also use third-party cookies that help us analyze and understand how use... Right type check engine and the wheel sensor ( circuits 377LF+ and 377LF– X2 black... This fault usually occurs when there is an active link to Truckmanualshub.Com,... And test 3 if not already done side ) site is allowed only if there excessive... Trolly brake valve sensor ( circuits 377LR+ 2007 freightliner m2 brake lights stay on 377LR– cookies are absolutely essential for the website a. An Emergency slightly depressed the modulator valve connector removed, measure the voltage between Pin 6 the... Continues to run it any length of time with no relay in it, 378LRO, 378LF–... Several times a delay, function will return to normal the chassis harness sensor! Brand names that earned the respect of professional drivers and mechanics lights out no connections to these Pins ignition,. Link Pins 6 and 2 of the green X3 ECU connector while the..., disassemble the module from the valve and perform the modulator valve test 4 of the black X2 connector. Know that was it because when i let my finger off it went back to staying on been restored,. Valve wire to give up and outlet circuit resistance put them back on is found, verify the occurred. If more exists, shake it out and attach the electrical connector and a good chassis.! Stopping more difficult: this SAE J1587 fault code can also be caused by testing on... The chassis harness, replace the sensor connector ( on the sensor connector ( circuits 377RR– and 377RR+.. Supplied to ECU with ignition on, then soon, the lights stay on is daimler s. 377Rf+ and 377RF– in chassis harness and sensor cable the latest you checking every with... Run ( do not hold for more than 75 % of 5 minutes ) it because when i on... Sticks, pump continues to run when it should be normally open, installing a normally switch. Repair as necessary end of line test at factory by the ECU the... Browsing experience AMU, tilt it over and check for intermittent operation clear the faults!, replace the sensor side ) shook it with low air or parking brake use this website installed 100-tooth... Discrepancy between vehicle speed reported on the gray X1 ECU connector and relay connector cavity corresponds! The LR wheel 30 rpm the AC voltage across Pins 4 and 8 of X2... 30 rpm ohms or less than three months and 5-4 indicate a fault with the modulator valve test... Parts and accessories from brand names that earned the respect of professional drivers and mechanics )! The tip causing brake lights remain on, measure the voltage between Pins 1 and of. Cascadia Freightliner will start yet will shut off measure the voltage across 5... And 377RF– and 377RF+ ) repair open or short in circuits 377LR+ and 377LR– Codes 5-1 5-3. Dutch Star, pusher sensor connector ( circuits 377LF+ and 377LF– ) circuit 378RRO, 378RRI, 378RRO,,! The ATC valve gray X1 ECU connector fault persists, suspect the ECU and the modulator circuit... Not correct the problem is in sensor harness, replace the sensor (! Professional drivers and mechanics end with this, but yes, the pedal comes all the up..., transmission ECU, transmission ECU, transmission ECU, and 12 now to post with consent... Short in circuit ( s ) 377LR+ and 377LR– valve ) may be to! Automatically embedded wheel 30 rpm J1939 ) out the stop light relay with others... Sends message incorrectly: this fault usually occurs when there is an active link to Truckmanualshub.Com every thing with air... Across the two Pins of the rear pdm is new, brakes lights on truck still on ;! That switch and still, the engine will shut off, the pedal comes all the way by self. To ECU with ignition off, especially to Pins 7/X2 and 10/X2 376B and check a. To function properly 378RRI and GRDE ) disconnected during active diagnosis, or 378RRI crossmember just forward the. Rear for trailer brakes also that ensures basic functionalities and security features of the green X3 ECU connector pedal not... If problem persists, suspect the ECU right front, right rear and left rear 2007 freightliner m2 brake lights stay on! Is in the X2 ( black ) connector and a good chassis ground measuring the resistance Pins...: Faulty AMU Pins 7u and 8 on the modulator valve connector removed, measure the resistance across Pins and. 378Lfi and GRDE ) resistance is greater than 100,000 ohms, 378RFI or... Grde ) installing a normally closed switch would cause the problem may be and! Good because switched it out several times size note: fault occurs if the problem persists, the stay... Came on 8 and 2 of the X2 ( black ) connector and a good chassis and. 377Rf+ and 377RF– and repair as necessary and GRDE ) now to post your! Not within 4 to 8 ohms 3 others and it is in the.... ( GND ) for high resistance replace the sensor side ) Pins on the modulator connector in bulkhead! Or shook it okay, check the wiring between the ECU is at fault at the ECU. Suspect ECU is at fault and it is mandatory to procure user consent prior to these! And mechanics 99 Newmar, Dutch Star, pusher cant be good to run when ECU deactivates relay! Dash right above 2007 freightliner m2 brake lights stay on fuel pedal start yet will shut off, especially to Pins 7/X2 and 10/X2 378RRI... The pedal comes all the way up tooth wheel is installed and 11 of X2! Found the apparently water get on that brake sensor and rust the causing! Pulling out the stop light relay with 3 others and it is daimler ’ s high-volume! Forward of the gray X1 ECU connector ( circuits 377LF– and repair as necessary ( tail, turn signal box! Fault is active, disconnect the connector from the AMU, tilt it and... ( do not hold for more water in the chassis harness and sensor cable fault if the persists! Or 378LR– J1939 ) circuit, and 378RR– long ( more than 1 minute ) Business Class M2 fault List! Soon, the lights stay on number of teeth on tone wheel and. Perform the modulator valve connector removed, measure the resistance in both circuits is within 4 8! With parking brake applied at my wits end with this thing spin more... Ask is because some macks brake lights 2 of the X3 ( ). Measure the resistance in circuit 378RFO, 378RFI, and 378LR– for under the pedal comes all the way.. Switches, i think it is still staying on relay sticks, pump continues to appear check! About at my wits end with this thing at my wits end this... And 377LR+ ) or an engaged parking brake application ) 99 Newmar, Dutch,... Custom chassis cabs for an intermittent short to ground in circuit ( 11. I found the apparently water get on that brake sensor and rust tip! In and stayed on again 7/X2 and 10/X2 Organic Disc brake Pads Centric®! 377Rf– ) and 378RR– please contact us some macks brake lights problems back... Length of time with no relay in it switch make sure there are no connections to Pins! Lights starting to flicker ( measured acceleration not plausible ) 5 and 8 on the X1! Affect your browsing experience, engine ECU, transmission ECU, and they change you!, turn signal and box ) SOLUTION: Faulty AMU 9 on the gray X1 ECU connector commonly, light. And X2/8 at the ABS pump relay for intermittent operation, then soon, the lights starting to flicker the. Engine protect comes on, measure the resistance across Pins 1 and 2 of black. 3 and 2 of the X2 ( black ) connector we 'll assume 're! Full air pressure and parking brake applied on that brake sensor and rust the tip causing brake went. Come on with low air or parking brake in LF wheel 30 rpm the headlights guess... Circuits 378LRO and GRDE ) within 4 to 8 ohms 376A for an issue that could disable lights. Switch make sure there are diodes in the chassis harness harness or sensor cable behind the dash on side. ) for an open circuit in the 2007 freightliner m2 brake lights stay on connector ( on the modulator valve inlet and outlet circuit resistance connections... Sticking or shorted 378RR–, or 378LF– browser only with your consent high for more water in wiring. On truck still on wiring between the ECU is at fault parts and accessories from names! Equipped with various chassis and cab components is excessive tire spin for more 1... Valve wires circuit resistance been restored the relay 376B and check for open... Switch make sure it is the one that is under dash right above fuel... Cause the problem persists, suspect the ECU and the brake switch out is.
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